diff --git a/core.asm b/core.asm
index 2678778..fda7797 100644
--- a/core.asm
+++ b/core.asm
@@ -99,10 +99,10 @@ tolower:
 	mov	rcx, rax
 	mov	al, byte [rdi]
 	cmp	rcx, 1
-	je	.dtl
-	.dtl:
+	jne	.quit
 	add	al, 32
 
+	.quit:
 	leave
 	ret
 ;----- toupper(char* c) -----;
@@ -116,9 +116,9 @@ toupper:
 	mov	rcx, rax
 	mov	al, byte [rdi]
 	cmp	rcx, 1
-	je	.dtu
-	.dtu:
+	jne	.quit
 	sub	al, 32
 
+	.quit:
 	leave
 	ret