diff --git a/apps/plugins/doom/rockmacros.h b/apps/plugins/doom/rockmacros.h
index 1ead411..d250629 100644
--- a/apps/plugins/doom/rockmacros.h
+++ b/apps/plugins/doom/rockmacros.h
@@ -72,8 +72,11 @@ int my_close(int id);
 #define strcat(a,b)        rb->strcat((a),(b))
 #define snprintf           rb->snprintf
 
-/* Using #define isn't enough with GCC 4.0.1 */
-inline void* memcpy(void* dst, const void* src, size_t size);
+static inline void* rock_memcpy(void* dst, const void* src, size_t size)
+{
+   return rb->memcpy(dst, src, size);
+}
+#define memcpy(dst,src,size) rock_memcpy(dst,src,size)
 
 #define PACKEDATTR __attribute__((packed)) // Needed for a few things
 #define GAMEBASE ROCKBOX_DIR "/doom/"