diff --git a/src/construction.cpp b/src/construction.cpp
index 894c65fde1471..85f9e34b99c38 100644
--- a/src/construction.cpp
+++ b/src/construction.cpp
@@ -1442,16 +1442,16 @@ void construct::done_wiring( const tripoint &p, Character &/*who*/ )
 
         bounding_box vehicle_box = veh->get_bounding_box( false );
         point size;
-        size.x = abs( ( vehicle_box.p2 - vehicle_box.p1 ).x ) + 1;
-        size.y = abs( ( vehicle_box.p2 - vehicle_box.p1 ).y ) + 1;
+        size.x = std::abs( ( vehicle_box.p2 - vehicle_box.p1 ).x ) + 1;
+        size.y = std::abs( ( vehicle_box.p2 - vehicle_box.p1 ).y ) + 1;
 
         vehicle &veh_target = vp->vehicle();
         if( &veh_target != veh && veh_target.has_tag( flag_WIRING ) ) {
             bounding_box target_vehicle_box = veh_target.get_bounding_box( false );
 
             point target_size;
-            target_size.x = abs( ( target_vehicle_box.p2 - target_vehicle_box.p1 ).x ) + 1;
-            target_size.y = abs( ( target_vehicle_box.p2 - target_vehicle_box.p1 ).y ) + 1;
+            target_size.x = std::abs( ( target_vehicle_box.p2 - target_vehicle_box.p1 ).x ) + 1;
+            target_size.y = std::abs( ( target_vehicle_box.p2 - target_vehicle_box.p1 ).y ) + 1;
 
             if( size.x + target_size.x <= MAX_WIRE_VEHICLE_SIZE &&
                 size.y + target_size.y <= MAX_WIRE_VEHICLE_SIZE ) {
diff --git a/src/faction_camp.cpp b/src/faction_camp.cpp
index c40bf11957682..17f732796ea13 100644
--- a/src/faction_camp.cpp
+++ b/src/faction_camp.cpp
@@ -2525,7 +2525,7 @@ static const int max_salt_water_pipe_length =
 //  Hard coded strings used to construct expansion "provides" needed by recipes to coordinate salt water pipe construction
 static const std::string salt_water_pipe_string_base = "salt_water_pipe_";
 static const std::string salt_water_pipe_string_suffix = "_scheduled";
-static const double diagonal_salt_pipe_cost = sqrt( 2.0 );
+static const double diagonal_salt_pipe_cost = std::sqrt( 2.0 );
 static const double salt_pipe_legal = 0.0;
 static const double salt_pipe_illegal = -0.1;
 static const double salt_pipe_swamp = -0.2;
diff --git a/src/item.cpp b/src/item.cpp
index 0607a68591d51..d70f2b4c2009b 100644
--- a/src/item.cpp
+++ b/src/item.cpp
@@ -4968,7 +4968,7 @@ void item::melee_combat_info( std::vector<iteminfo> &info, const iteminfo_query
 
         if( base_stamina || base_dpstam ) {
             stam = player_character.get_total_melee_stamina_cost( this ) * -1;
-            stam_pct = truncf( stam * 1000.0 / player_character.get_stamina_max() ) / 10;
+            stam_pct = std::truncf( stam * 1000.0 / player_character.get_stamina_max() ) / 10;
         }
 
         if( base_dps || base_dpstam ) {
diff --git a/src/material.cpp b/src/material.cpp
index 841222d10164b..8b085de3d55da 100644
--- a/src/material.cpp
+++ b/src/material.cpp
@@ -282,7 +282,7 @@ bool material_type::is_valid_thickness( float thickness ) const
     }
 
     // float calcs so rounding need to be mindful of
-    return fmodf( thickness, _sheet_thickness ) < .01;
+    return std::fmod( thickness, _sheet_thickness ) < .01f;
 }
 
 float material_type::thickness_multiple() const