diff --git a/src/string.asm b/src/string.asm
index 4563754..9205533 100644
--- a/src/string.asm
+++ b/src/string.asm
@@ -11,7 +11,7 @@ section .text
 ;	rdi*	(arg) Pointer to str[]
 ;	rcx*	Counter for scasb
 strlen:
-	xor	rax, rax
+	xor	al, al
 	mov	rcx, -1
 	cld
 	repne	scasb