diff --git a/CMakeLists.txt b/CMakeLists.txt
index 99e44950c5..ec933807e0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1060,8 +1060,10 @@ if(SDL_LIBC)
   cmake_push_check_state()
   if(MSVC)
     string(APPEND CMAKE_REQUIRED_FLAGS " -we4244 -WX")  # 'conversion' conversion from 'type1' to 'type2', possible loss of data
-  else()
+  elseif(HAVE_GCC_WFLOAT_CONVERSION)
     string(APPEND CMAKE_REQUIRED_FLAGS " -Wfloat-conversion -Werror")
+  else()
+    string(APPEND CMAKE_REQUIRED_FLAGS " -Wconversion -Werror")
   endif()
   foreach(math_fn isinf isnan)
     string(TOUPPER "${math_fn}" MATH_FN)