diff --git a/crc16.s b/crc16.s
index 000465d..16f446d 100644
--- a/crc16.s
+++ b/crc16.s
@@ -31,7 +31,7 @@ crc16:
 	popw	%bp
 	ret
 .L5:
-	movb	(%bx),	%dl
+	movb	%cs:(%bx),	%dl
 	movb	$8,	%cl
 	shlw	%cl,	%dx
 	xorw	%dx,	%ax