diff --git a/sdk/steam/steam_api_common.h b/sdk/steam/steam_api_common.h
index 102e59ac..53da20b4 100644
--- a/sdk/steam/steam_api_common.h
+++ b/sdk/steam/steam_api_common.h
@@ -80,6 +80,9 @@ typedef char SteamErrMsg[ k_cchMaxSteamErrMsg ];
 
 // function prototype
 #if defined( POSIX )
+#if defined( __cdecl )
+	#undef __cdecl
+#endif
 #define __cdecl
 #endif
 extern "C" typedef void (__cdecl *SteamAPIWarningMessageHook_t)(int, const char *);