diff --git a/cmake/px4_add_common_flags.cmake b/cmake/px4_add_common_flags.cmake
index bf83ceb0f0..b97d591c7b 100644
--- a/cmake/px4_add_common_flags.cmake
+++ b/cmake/px4_add_common_flags.cmake
@@ -144,7 +144,6 @@ function(px4_add_common_flags)
 	list(APPEND c_flags
 		-fno-common
 
-		-Wbad-function-cast
 		-Wnested-externs
 		-Wstrict-prototypes
 	)
diff --git a/platforms/nuttx/cmake/px4_impl_os.cmake b/platforms/nuttx/cmake/px4_impl_os.cmake
index d68b4becb7..87c24cabbf 100644
--- a/platforms/nuttx/cmake/px4_impl_os.cmake
+++ b/platforms/nuttx/cmake/px4_impl_os.cmake
@@ -69,6 +69,8 @@ function(px4_os_add_flags)
 
 	add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-fno-sized-deallocation>)
 
+	add_compile_options($<$<COMPILE_LANGUAGE:C>:-Wbad-function-cast>)
+
 	add_definitions(
 		-D__PX4_NUTTX
 
diff --git a/platforms/posix/cmake/px4_impl_os.cmake b/platforms/posix/cmake/px4_impl_os.cmake
index b334336ab4..49c3813bda 100644
--- a/platforms/posix/cmake/px4_impl_os.cmake
+++ b/platforms/posix/cmake/px4_impl_os.cmake
@@ -238,6 +238,8 @@ function(px4_os_add_flags)
 
 	endif()
 
+	add_compile_options($<$<COMPILE_LANGUAGE:C>:-Wbad-function-cast>)
+
 endfunction()
 
 #=============================================================================