diff --git a/libsrc/atari/open.s b/libsrc/atari/open.s
index d39a4050e..7904586f2 100644
--- a/libsrc/atari/open.s
+++ b/libsrc/atari/open.s
@@ -202,8 +202,8 @@ found:	rts
 	ldy	#15
 	lda	#0
 loop:	sta	ICHID,x
-	dey
 	inx
+	dey
 	bne	loop
 	rts