diff --git a/src/avatar.cpp b/src/avatar.cpp
index d89c4b3cad279..52e4191142c33 100644
--- a/src/avatar.cpp
+++ b/src/avatar.cpp
@@ -1,7 +1,7 @@
 #include "avatar.h"
 
-#include <limits.h>
-#include <stdlib.h>
+#include <climits>
+#include <cstdlib>
 #include <algorithm>
 #include <list>
 #include <map>
diff --git a/src/avatar.h b/src/avatar.h
index 92eda70fc169c..341df17c8f5ce 100644
--- a/src/avatar.h
+++ b/src/avatar.h
@@ -2,7 +2,7 @@
 #ifndef AVATAR_H
 #define AVATAR_H
 
-#include <stddef.h>
+#include <cstddef>
 #include <iosfwd>
 #include <string>
 #include <unordered_set>
diff --git a/src/avatar_action.cpp b/src/avatar_action.cpp
index 3243d03bc5e94..cf0bcd919f778 100644
--- a/src/avatar_action.cpp
+++ b/src/avatar_action.cpp
@@ -1,6 +1,6 @@
 #include "avatar_action.h"
 
-#include <stdlib.h>
+#include <cstdlib>
 #include <algorithm>
 #include <functional>
 #include <memory>
diff --git a/src/avatar_action.h b/src/avatar_action.h
index a4e8aa06f6611..df18173e592d6 100644
--- a/src/avatar_action.h
+++ b/src/avatar_action.h
@@ -2,7 +2,7 @@
 #ifndef AVATAR_ACTION_H
 #define AVATAR_ACTION_H
 
-#include <limits.h>
+#include <climits>
 
 #include "optional.h"
 #include "point.h"
diff --git a/src/behavior.cpp b/src/behavior.cpp
index 2208bc873040c..2d911d16fe5b1 100644
--- a/src/behavior.cpp
+++ b/src/behavior.cpp
@@ -1,6 +1,6 @@
 #include "behavior.h"
 
-#include <assert.h>
+#include <cassert>
 #include <list>
 #include <set>
 #include <unordered_map>
diff --git a/src/character.cpp b/src/character.cpp
index f8c0af9416e00..aceba9460129c 100644
--- a/src/character.cpp
+++ b/src/character.cpp
@@ -1,6 +1,6 @@
 #include "character.h"
 
-#include <ctype.h>
+#include <cctype>
 #include <climits>
 #include <cstdlib>
 #include <algorithm>
diff --git a/src/clzones.h b/src/clzones.h
index 9c5bd5e44153e..db3485286b61b 100644
--- a/src/clzones.h
+++ b/src/clzones.h
@@ -2,7 +2,7 @@
 #ifndef CLZONES_H
 #define CLZONES_H
 
-#include <stddef.h>
+#include <cstddef>
 #include <map>
 #include <unordered_map>
 #include <unordered_set>
diff --git a/src/construction_category.h b/src/construction_category.h
index 21619a84fcd48..acf944a3328fd 100644
--- a/src/construction_category.h
+++ b/src/construction_category.h
@@ -2,7 +2,7 @@
 #ifndef CONSTRUCTION_CATEGORY_H
 #define CONSTRUCTION_CATEGORY_H
 
-#include <stddef.h>
+#include <cstddef>
 #include <string>
 #include <vector>
 
diff --git a/src/craft_command.cpp b/src/craft_command.cpp
index 8e43f6aebc60d..73018b9fdae28 100644
--- a/src/craft_command.cpp
+++ b/src/craft_command.cpp
@@ -1,6 +1,6 @@
 #include "craft_command.h"
 
-#include <limits.h>
+#include <climits>
 #include <cstdlib>
 #include <algorithm>
 #include <limits>
diff --git a/src/debug_menu.cpp b/src/debug_menu.cpp
index 85f9f02830f8b..a5442c61ed99e 100644
--- a/src/debug_menu.cpp
+++ b/src/debug_menu.cpp
@@ -1,8 +1,8 @@
 #include "debug_menu.h"
 
 // IWYU pragma: no_include <cxxabi.h>
-#include <limits.h>
-#include <stdint.h>
+#include <climits>
+#include <cstdint>
 #include <algorithm>
 #include <chrono>
 #include <vector>
@@ -67,7 +67,7 @@
 #include "artifact.h"
 #include "vpart_position.h"
 #include "rng.h"
-#include "signal.h"
+#include <csignal>
 #include "magic.h"
 #include "bodypart.h"
 #include "calendar.h"
diff --git a/src/faction.cpp b/src/faction.cpp
index 20c45c6040206..428a7afe4f463 100644
--- a/src/faction.cpp
+++ b/src/faction.cpp
@@ -1,6 +1,6 @@
 #include "faction.h"
 
-#include <assert.h>
+#include <cassert>
 #include <cstdlib>
 #include <bitset>
 #include <map>
diff --git a/src/field_type.h b/src/field_type.h
index 38ebeaf7dac30..bc11a7d4e9e40 100644
--- a/src/field_type.h
+++ b/src/field_type.h
@@ -2,8 +2,8 @@
 #ifndef FIELD_TYPE_H
 #define FIELD_TYPE_H
 
-#include <stddef.h>
-#include <stdint.h>
+#include <cstddef>
+#include <cstdint>
 #include <algorithm>
 #include <vector>
 #include <memory>
diff --git a/src/game.cpp b/src/game.cpp
index cf302c07f754e..2032b72754951 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -1,7 +1,7 @@
 #include "game.h"
 
-#include <wctype.h>
-#include <assert.h>
+#include <cwctype>
+#include <cassert>
 #include <cstdio>
 #include <algorithm>
 #include <chrono>
diff --git a/src/game_inventory.cpp b/src/game_inventory.cpp
index 9e12d92f2c4f3..812aa3f5c484b 100644
--- a/src/game_inventory.cpp
+++ b/src/game_inventory.cpp
@@ -1,6 +1,6 @@
 #include "game_inventory.h"
 
-#include <math.h>
+#include <cmath>
 #include <climits>
 #include <cstddef>
 #include <functional>
diff --git a/src/handle_liquid.cpp b/src/handle_liquid.cpp
index 58d75755b5814..cfdad43df3832 100644
--- a/src/handle_liquid.cpp
+++ b/src/handle_liquid.cpp
@@ -1,7 +1,7 @@
 #include "handle_liquid.h"
 
-#include <limits.h>
-#include <stddef.h>
+#include <climits>
+#include <cstddef>
 #include <algorithm>
 #include <functional>
 #include <iterator>
diff --git a/src/inventory_ui.h b/src/inventory_ui.h
index 2faa88ef67bca..5d5105bc77c3d 100644
--- a/src/inventory_ui.h
+++ b/src/inventory_ui.h
@@ -2,7 +2,7 @@
 #ifndef INVENTORY_UI_H
 #define INVENTORY_UI_H
 
-#include <assert.h>
+#include <cassert>
 #include <climits>
 #include <cstddef>
 #include <functional>
diff --git a/src/item.h b/src/item.h
index 6daece3776d93..f0ac233d5ef52 100644
--- a/src/item.h
+++ b/src/item.h
@@ -2,7 +2,7 @@
 #ifndef ITEM_H
 #define ITEM_H
 
-#include <stdint.h>
+#include <cstdint>
 #include <climits>
 #include <list>
 #include <map>
diff --git a/src/magic.cpp b/src/magic.cpp
index 16bad5b8fbdc2..47ad78291b9f8 100644
--- a/src/magic.cpp
+++ b/src/magic.cpp
@@ -1,6 +1,6 @@
 #include "magic.h"
 
-#include <stdlib.h>
+#include <cstdlib>
 #include <set>
 #include <algorithm>
 #include <array>
diff --git a/src/magic.h b/src/magic.h
index f8e3b5dcc4ecc..d57ef3d6e6bae 100644
--- a/src/magic.h
+++ b/src/magic.h
@@ -2,7 +2,7 @@
 #ifndef MAGIC_H
 #define MAGIC_H
 
-#include <stddef.h>
+#include <cstddef>
 #include <map>
 #include <set>
 #include <string>
diff --git a/src/magic_spell_effect.cpp b/src/magic_spell_effect.cpp
index 1159b3f4d8458..c6fac1357fcf4 100644
--- a/src/magic_spell_effect.cpp
+++ b/src/magic_spell_effect.cpp
@@ -1,6 +1,6 @@
-#include <limits.h>
-#include <math.h>
-#include <stdlib.h>
+#include <climits>
+#include <cmath>
+#include <cstdlib>
 #include <set>
 #include <algorithm>
 #include <array>
diff --git a/src/magic_teleporter_list.cpp b/src/magic_teleporter_list.cpp
index b93f72c870cf2..d6f2a3df7aa4c 100644
--- a/src/magic_teleporter_list.cpp
+++ b/src/magic_teleporter_list.cpp
@@ -1,6 +1,6 @@
 #include "magic_teleporter_list.h"
 
-#include <stddef.h>
+#include <cstddef>
 #include <map>
 #include <algorithm>
 #include <memory>
diff --git a/src/main.cpp b/src/main.cpp
index 21536165ad805..8da3f3577441b 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -19,7 +19,7 @@
 #if defined(_WIN32)
 #include "platform_win.h"
 #else
-#include <signal.h>
+#include <csignal>
 #endif
 #include "color.h"
 #include "crash.h"
diff --git a/src/map_extras.h b/src/map_extras.h
index a079fa5c33fc9..fe92449cce025 100644
--- a/src/map_extras.h
+++ b/src/map_extras.h
@@ -2,7 +2,7 @@
 #ifndef MAP_EXTRAS_H
 #define MAP_EXTRAS_H
 
-#include <stdint.h>
+#include <cstdint>
 #include <string>
 #include <unordered_map>
 
diff --git a/src/mapgen.cpp b/src/mapgen.cpp
index 47ae641a37b4d..a9203ea60a67b 100644
--- a/src/mapgen.cpp
+++ b/src/mapgen.cpp
@@ -1,6 +1,6 @@
 #include "mapgen.h"
 
-#include <assert.h>
+#include <cassert>
 #include <cstdlib>
 #include <algorithm>
 #include <list>
diff --git a/src/monattack.cpp b/src/monattack.cpp
index 5c0af3f8b1283..e4d5a863f55aa 100644
--- a/src/monattack.cpp
+++ b/src/monattack.cpp
@@ -1,6 +1,6 @@
 #include "monattack.h"
 
-#include <assert.h>
+#include <cassert>
 #include <climits>
 #include <cstdlib>
 #include <algorithm>
diff --git a/src/npctrade.cpp b/src/npctrade.cpp
index f2f33c4bf76ca..2f7e6c1c6cd34 100644
--- a/src/npctrade.cpp
+++ b/src/npctrade.cpp
@@ -1,6 +1,6 @@
 #include "npctrade.h"
 
-#include <limits.h>
+#include <climits>
 #include <cstdlib>
 #include <algorithm>
 #include <string>
diff --git a/src/npctrade.h b/src/npctrade.h
index 1413656975fde..2ba4aa91cc0f3 100644
--- a/src/npctrade.h
+++ b/src/npctrade.h
@@ -2,7 +2,7 @@
 #ifndef NPCTRADE_H
 #define NPCTRADE_H
 
-#include <stddef.h>
+#include <cstddef>
 #include <vector>
 #include <string>
 #include <utility>
diff --git a/src/output.cpp b/src/output.cpp
index ef614fe5b395c..e36ee01f5f4fc 100644
--- a/src/output.cpp
+++ b/src/output.cpp
@@ -1,6 +1,6 @@
 #include "output.h"
 
-#include <errno.h>
+#include <cerrno>
 #include <cctype>
 #include <cstdio>
 #include <algorithm>
diff --git a/src/pixel_minimap.cpp b/src/pixel_minimap.cpp
index 6a00d83ee5584..2c9b59f5fa387 100644
--- a/src/pixel_minimap.cpp
+++ b/src/pixel_minimap.cpp
@@ -23,13 +23,13 @@
 
 #include <algorithm>
 #include <array>
-#include <assert.h>
+#include <cassert>
 #include <bitset>
 #include <cmath>
 #include <iterator>
 #include <memory>
 #include <set>
-#include <stdlib.h>
+#include <cstdlib>
 #include <utility>
 #include <vector>
 
diff --git a/src/requirements.cpp b/src/requirements.cpp
index e5ec728320727..3563635cbca89 100644
--- a/src/requirements.cpp
+++ b/src/requirements.cpp
@@ -1,6 +1,6 @@
 #include "requirements.h"
 
-#include <limits.h>
+#include <climits>
 #include <cstdlib>
 #include <algorithm>
 #include <limits>
diff --git a/src/rng.cpp b/src/rng.cpp
index 8acab811637a2..63a643e183d54 100644
--- a/src/rng.cpp
+++ b/src/rng.cpp
@@ -1,6 +1,6 @@
 #include "rng.h"
 
-#include <math.h>
+#include <cmath>
 #include <chrono>
 #include <utility>
 
diff --git a/src/savegame_json.cpp b/src/savegame_json.cpp
index 36d0685edf2b4..3545b43368581 100644
--- a/src/savegame_json.cpp
+++ b/src/savegame_json.cpp
@@ -5,7 +5,7 @@
 #include "npc_favor.h" // IWYU pragma: associated
 #include "pldata.h" // IWYU pragma: associated
 
-#include <limits.h>
+#include <climits>
 #include <cctype>
 #include <cstddef>
 #include <algorithm>
diff --git a/src/sdl_utils.cpp b/src/sdl_utils.cpp
index cdd776328baae..3b47c1b557009 100644
--- a/src/sdl_utils.cpp
+++ b/src/sdl_utils.cpp
@@ -2,7 +2,7 @@
 
 #include "sdl_utils.h"
 
-#include <stddef.h>
+#include <cstddef>
 #include <array>
 
 #include "color.h"
diff --git a/src/sdltiles.cpp b/src/sdltiles.cpp
index ee4dd5f1d09f1..bdb00e4d0372b 100644
--- a/src/sdltiles.cpp
+++ b/src/sdltiles.cpp
@@ -3,7 +3,7 @@
 #include "sdltiles.h" // IWYU pragma: associated
 #include "cursesdef.h" // IWYU pragma: associated
 
-#include <stdint.h>
+#include <cstdint>
 #include <climits>
 #include <algorithm>
 #include <cassert>
diff --git a/src/string_input_popup.h b/src/string_input_popup.h
index f8124aa849fa8..e1914e34f8215 100644
--- a/src/string_input_popup.h
+++ b/src/string_input_popup.h
@@ -2,7 +2,7 @@
 #ifndef STRING_INPUT_POPUP_H
 #define STRING_INPUT_POPUP_H
 
-#include <stdint.h>
+#include <cstdint>
 #include <cstddef>
 #include <functional>
 #include <map>
diff --git a/src/ui.cpp b/src/ui.cpp
index 13d86ab4a2d1c..7b2bedc127ea5 100644
--- a/src/ui.cpp
+++ b/src/ui.cpp
@@ -1,6 +1,6 @@
 #include "ui.h"
 
-#include <assert.h>
+#include <cassert>
 #include <cctype>
 #include <climits>
 #include <cstdlib>
diff --git a/tests/bionics_test.cpp b/tests/bionics_test.cpp
index 03cad7b9cef50..573d84a3e6d92 100644
--- a/tests/bionics_test.cpp
+++ b/tests/bionics_test.cpp
@@ -1,5 +1,5 @@
-#include <limits.h>
-#include <stddef.h>
+#include <climits>
+#include <cstddef>
 #include <list>
 #include <memory>
 #include <string>
diff --git a/tests/colony_test.cpp b/tests/colony_test.cpp
index e2ae8f0f6ad5a..ba774b6983c7d 100644
--- a/tests/colony_test.cpp
+++ b/tests/colony_test.cpp
@@ -1,4 +1,4 @@
-#include <stddef.h>
+#include <cstddef>
 #include <algorithm> // std::find
 #include <functional> // std::greater
 #include <utility> // std::move
diff --git a/tests/comestible_tests.cpp b/tests/comestible_tests.cpp
index 9b525f6e5912d..a18d06a17d55a 100644
--- a/tests/comestible_tests.cpp
+++ b/tests/comestible_tests.cpp
@@ -1,4 +1,4 @@
-#include <stdio.h>
+#include <cstdio>
 #include <algorithm>
 #include <list>
 #include <map>
diff --git a/tests/crafting_test.cpp b/tests/crafting_test.cpp
index 88991a8acd950..a3ec63c051d9a 100644
--- a/tests/crafting_test.cpp
+++ b/tests/crafting_test.cpp
@@ -1,4 +1,4 @@
-#include <limits.h>
+#include <climits>
 #include <sstream>
 #include <algorithm>
 #include <list>
diff --git a/tests/creature_test.cpp b/tests/creature_test.cpp
index 257066ac1af26..62d3f27d4554c 100644
--- a/tests/creature_test.cpp
+++ b/tests/creature_test.cpp
@@ -1,4 +1,4 @@
-#include <stdlib.h>
+#include <cstdlib>
 #include <map>
 #include <utility>
 
diff --git a/tests/fake_messages.cpp b/tests/fake_messages.cpp
index 480f7ebea20d4..6bca667a402d7 100644
--- a/tests/fake_messages.cpp
+++ b/tests/fake_messages.cpp
@@ -1,4 +1,4 @@
-#include <stddef.h>
+#include <cstddef>
 #include <string>
 #include <utility>
 #include <vector>
diff --git a/tests/health_test.cpp b/tests/health_test.cpp
index f835d002e5c24..698dad13bfc7f 100644
--- a/tests/health_test.cpp
+++ b/tests/health_test.cpp
@@ -1,4 +1,4 @@
-#include <stddef.h>
+#include <cstddef>
 #include <sstream>
 #include <array>
 #include <vector>
diff --git a/tests/invlet_test.cpp b/tests/invlet_test.cpp
index 3119a59d654a9..bcf9b48aa64d7 100644
--- a/tests/invlet_test.cpp
+++ b/tests/invlet_test.cpp
@@ -1,4 +1,4 @@
-#include <stddef.h>
+#include <cstddef>
 #include <sstream>
 #include <list>
 #include <map>
diff --git a/tests/iuse_test.cpp b/tests/iuse_test.cpp
index 3cb25a3aba25b..c7963425ffc80 100644
--- a/tests/iuse_test.cpp
+++ b/tests/iuse_test.cpp
@@ -1,4 +1,4 @@
-#include <limits.h>
+#include <climits>
 #include <list>
 #include <memory>
 
diff --git a/tests/line_test.cpp b/tests/line_test.cpp
index f7dc61528ce4e..f2f2481e9cdc7 100644
--- a/tests/line_test.cpp
+++ b/tests/line_test.cpp
@@ -1,4 +1,4 @@
-#include <time.h>
+#include <ctime>
 #include <chrono>
 #include <cstdio>
 #include <algorithm>
diff --git a/tests/map_memory.cpp b/tests/map_memory.cpp
index 21f43811b122a..26e01337fbd3c 100644
--- a/tests/map_memory.cpp
+++ b/tests/map_memory.cpp
@@ -1,4 +1,4 @@
-#include <stdio.h>
+#include <cstdio>
 #include <sstream>
 #include <bitset>
 #include <string>
diff --git a/tests/math_functions.cpp b/tests/math_functions.cpp
index c3c3d8846401f..2ba62a55ff289 100644
--- a/tests/math_functions.cpp
+++ b/tests/math_functions.cpp
@@ -1,4 +1,4 @@
-#include <stddef.h>
+#include <cstddef>
 #include <cmath>
 #include <random>
 
diff --git a/tests/melee_test.cpp b/tests/melee_test.cpp
index 09bc0ca573648..0f03f85dc7fa4 100644
--- a/tests/melee_test.cpp
+++ b/tests/melee_test.cpp
@@ -1,4 +1,4 @@
-#include <stddef.h>
+#include <cstddef>
 #include <sstream>
 #include <string>
 
diff --git a/tests/monster_test.cpp b/tests/monster_test.cpp
index c3b4427b322b6..d655a7ee41665 100644
--- a/tests/monster_test.cpp
+++ b/tests/monster_test.cpp
@@ -1,4 +1,4 @@
-#include <math.h>
+#include <cmath>
 #include <fstream>
 #include <sstream>
 #include <string>
diff --git a/tests/npc_talk_test.cpp b/tests/npc_talk_test.cpp
index 95030b3ed27ea..c59e1c55a223c 100644
--- a/tests/npc_talk_test.cpp
+++ b/tests/npc_talk_test.cpp
@@ -1,4 +1,4 @@
-#include <stdio.h>
+#include <cstdio>
 #include <string>
 #include <memory>
 #include <vector>
diff --git a/tests/npc_test.cpp b/tests/npc_test.cpp
index 2b4d53105576a..2988840121c43 100644
--- a/tests/npc_test.cpp
+++ b/tests/npc_test.cpp
@@ -1,4 +1,4 @@
-#include <stddef.h>
+#include <cstddef>
 #include <string>
 #include <memory>
 #include <set>
diff --git a/tests/reloading_test.cpp b/tests/reloading_test.cpp
index 292b15dbcd229..47c02e4aa4cb0 100644
--- a/tests/reloading_test.cpp
+++ b/tests/reloading_test.cpp
@@ -1,4 +1,4 @@
-#include <limits.h>
+#include <climits>
 #include <list>
 #include <memory>
 #include <set>
diff --git a/tests/rot_test.cpp b/tests/rot_test.cpp
index 8e1f874af3bff..8a172751aaca5 100644
--- a/tests/rot_test.cpp
+++ b/tests/rot_test.cpp
@@ -1,4 +1,4 @@
-#include <stdlib.h>
+#include <cstdlib>
 #include <memory>
 #include <string>
 
diff --git a/tests/stomach_contents_tests.cpp b/tests/stomach_contents_tests.cpp
index 7c13bc8e6c7da..89d86403380b0 100644
--- a/tests/stomach_contents_tests.cpp
+++ b/tests/stomach_contents_tests.cpp
@@ -1,4 +1,4 @@
-#include <stdio.h>
+#include <cstdio>
 #include <memory>
 
 #include "avatar.h"
diff --git a/tests/string_formatter_test.cpp b/tests/string_formatter_test.cpp
index 0c2e043d1cad5..001a83c06e95d 100644
--- a/tests/string_formatter_test.cpp
+++ b/tests/string_formatter_test.cpp
@@ -1,4 +1,4 @@
-#include <stddef.h>
+#include <cstddef>
 #include <limits>
 #include <string>
 #include <utility>
diff --git a/tests/temperature_test.cpp b/tests/temperature_test.cpp
index cf1629f0c0bea..773a01ea61b8a 100644
--- a/tests/temperature_test.cpp
+++ b/tests/temperature_test.cpp
@@ -1,4 +1,4 @@
-#include <stdlib.h>
+#include <cstdlib>
 #include <memory>
 #include <string>
 
diff --git a/tests/test_main.cpp b/tests/test_main.cpp
index 65d7d2db73153..446426bb7f92c 100644
--- a/tests/test_main.cpp
+++ b/tests/test_main.cpp
@@ -13,9 +13,9 @@
 #endif // _GLIBCXX_DEBUG
 
 #define CATCH_CONFIG_RUNNER
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
+#include <cassert>
+#include <cstdio>
+#include <cstdlib>
 #include <algorithm>
 #include <cstring>
 #include <chrono>
diff --git a/tests/vehicle_drag.cpp b/tests/vehicle_drag.cpp
index 6ff2a3abe5e55..34600c61708aa 100644
--- a/tests/vehicle_drag.cpp
+++ b/tests/vehicle_drag.cpp
@@ -1,4 +1,4 @@
-#include <stdio.h>
+#include <cstdio>
 #include <memory>
 #include <string>
 #include <vector>
diff --git a/tests/vehicle_efficiency.cpp b/tests/vehicle_efficiency.cpp
index 9017a17cd9506..e45c978e21c2c 100644
--- a/tests/vehicle_efficiency.cpp
+++ b/tests/vehicle_efficiency.cpp
@@ -1,5 +1,5 @@
-#include <stdio.h>
-#include <stdlib.h>
+#include <cstdio>
+#include <cstdlib>
 #include <sstream>
 #include <algorithm>
 #include <cmath>
diff --git a/tests/vision_test.cpp b/tests/vision_test.cpp
index bf9c86a7407c4..41abaddd4cf26 100644
--- a/tests/vision_test.cpp
+++ b/tests/vision_test.cpp
@@ -1,4 +1,4 @@
-#include <stddef.h>
+#include <cstddef>
 #include <iomanip>
 #include <sstream>
 #include <algorithm>
diff --git a/tests/wield_times_test.cpp b/tests/wield_times_test.cpp
index fd5d4a7667769..2d16fd1efa5cc 100644
--- a/tests/wield_times_test.cpp
+++ b/tests/wield_times_test.cpp
@@ -1,4 +1,4 @@
-#include <stdio.h>
+#include <cstdio>
 #include <string>
 #include <list>
 #include <memory>