diff --git a/c64/kernal/iec_wait_for_clock_release.s b/c64/kernal/iec_wait_for_clock_release.s
index c7a4ce1b..cb5d8c72 100644
--- a/c64/kernal/iec_wait_for_clock_release.s
+++ b/c64/kernal/iec_wait_for_clock_release.s
@@ -1,5 +1,5 @@
 iec_wait_for_clock_release:
 	LDA $DD00
-	and #$80
+	and #$40
 	beq iec_wait_for_clock_release
 	rts