diff --git a/firmware/sysdefs.h b/firmware/sysdefs.h
index 7c2d3d5..10ebfb4 100644
--- a/firmware/sysdefs.h
+++ b/firmware/sysdefs.h
@@ -62,7 +62,9 @@ typedef unsigned char byte_t;
 #endif
 
 // Save some space
+#ifndef SIMULATOR
 #define memcpy memmove
+#endif
 
 #endif