diff --git a/log/src/CMakeLists.txt b/log/src/CMakeLists.txt
index b42b8f142..e167185fc 100644
--- a/log/src/CMakeLists.txt
+++ b/log/src/CMakeLists.txt
@@ -7,6 +7,15 @@ ign_add_component(log SOURCES ${sources} GET_TARGET_NAME log_lib_target)
 target_link_libraries(${log_lib_target}
   PRIVATE SQLite3::SQLite3)
 
+if (MSVC)
+  # Warning #4251 is the "dll-interface" warning that tells you when types used
+  # by a class are not being exported. These generated source files have private
+  # members that don't get exported, so they trigger this warning. However, the
+  # warning is not important since those members do not need to be interfaced
+  # with.
+  set_source_files_properties(${sources} ${gtest_sources} COMPILE_FLAGS "/wd4251 /wd4146")
+endif()
+
 # Unit tests
 ign_build_tests(
   TYPE "UNIT"
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 7d3d64c90..f9f50c26f 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -8,6 +8,15 @@ if (MSVC)
   list(REMOVE_ITEM gtest_sources ign_TEST.cc)
 endif()
 
+if (MSVC)
+  # Warning #4251 is the "dll-interface" warning that tells you when types used
+  # by a class are not being exported. These generated source files have private
+  # members that don't get exported, so they trigger this warning. However, the
+  # warning is not important since those members do not need to be interfaced
+  # with.
+  set_source_files_properties(${sources} ${gtest_sources} COMPILE_FLAGS "/wd4251 /wd4146")
+endif()
+
 # Create the library target.
 ign_create_core_library(SOURCES ${sources} CXX_STANDARD 17)