diff --git a/polymer/eduke32/build/src/polymost.c b/polymer/eduke32/build/src/polymost.c
index 6d79d99e0..4de4d0870 100644
--- a/polymer/eduke32/build/src/polymost.c
+++ b/polymer/eduke32/build/src/polymost.c
@@ -4568,7 +4568,7 @@ char cullmodel[MAXSPRITES];
 int32_t cullcheckcnt = 0;
 
 #ifndef _MSC_VER
-#ifdef __GNUC__
+#if defined (__GNUC__) && defined(__i386__)
 #ifndef __fastcall
 #define __fastcall __attribute__((fastcall))
 #endif