diff --git a/dosclock.asm b/dosclock.asm
index d4a73a3..55b3255 100644
--- a/dosclock.asm
+++ b/dosclock.asm
@@ -82,8 +82,8 @@ clear_screen:
 	xor bp, bp
 	.loop:
 		mov word [es:bp], 0
-		inc bp
-		cmp bp, 320*200/2
+		add bp, 2
+		cmp bp, 320*200
 		jne .loop
 
 	pop bp