diff --git a/libvo/fastmemcpy.h b/libvo/fastmemcpy.h
index 16767d9842..a28f495486 100644
--- a/libvo/fastmemcpy.h
+++ b/libvo/fastmemcpy.h
@@ -22,14 +22,12 @@
 #include "config.h"
 #include <inttypes.h>
 #include <string.h>
-
-#if defined(CONFIG_FASTMEMCPY) && (HAVE_MMX || HAVE_MMX2 || HAVE_AMD3DNOW /* || HAVE_SSE || HAVE_SSE2 */)
 #include <stddef.h>
 
 void * fast_memcpy(void * to, const void * from, size_t len);
 void * mem2agpcpy(void * to, const void * from, size_t len);
 
-#else
+#if ! defined(CONFIG_FASTMEMCPY) && ! (HAVE_MMX || HAVE_MMX2 || HAVE_AMD3DNOW /* || HAVE_SSE || HAVE_SSE2 */)
 #define mem2agpcpy(a,b,c) memcpy(a,b,c)
 #define fast_memcpy(a,b,c) memcpy(a,b,c)
 #endif