diff --git a/lib/libc/memmove.c b/lib/libc/memmove.c
index 5c2b661..6451e4e 100644
--- a/lib/libc/memmove.c
+++ b/lib/libc/memmove.c
@@ -16,7 +16,7 @@
 	 * that issue is probably moot as such usage is probably undefined
 	 * behaviour and a bug anyway.
 	 */
-	if ((size_t)dst - (size_t)src >= len) {
+	if (((size_t)dst - (size_t)src) >= len) {
 		/* destination not in source data, so can safely use memcpy */
 		return memcpy(dst, src, len);
 	} else {