diff --git a/include/freetype/internal/compiler-macros.h b/include/freetype/internal/compiler-macros.h
index 88c0bf0..1a6633c 100644
--- a/include/freetype/internal/compiler-macros.h
+++ b/include/freetype/internal/compiler-macros.h
@@ -295,17 +295,15 @@ FT_BEGIN_HEADER
    */
 #ifdef __cplusplus
 #define FT_CALLBACK_DEF( x )  extern "C"  x
 #else
 #define FT_CALLBACK_DEF( x )  static  x
 #endif
 
-#if defined( __i386__ )
-#define FT_COMPARE_DEF( x )  FT_CALLBACK_DEF( x ) __attribute__(( cdecl ))
-#elif defined( _M_IX86 )
+#if defined( _MSC_VER ) && defined( _M_IX86 )
 #define FT_COMPARE_DEF( x )  FT_CALLBACK_DEF( x ) __cdecl
 #else
 #define FT_COMPARE_DEF( x )  FT_CALLBACK_DEF( x )
 #endif
 
 #define FT_BASE_CALLBACK( x )      FT_FUNCTION_DECLARATION( x )
 #define FT_BASE_CALLBACK_DEF( x )  FT_FUNCTION_DEFINITION( x )