diff --git a/util/parity.s65 b/util/parity.s65
index 3ef087c..a340bbb 100644
--- a/util/parity.s65
+++ b/util/parity.s65
@@ -8,7 +8,7 @@
 ;; @returns Y: The number of set bits in the byte
 ;;********************************************************************************
 .proc count_set_bits
-    ldx #8
+    ldx #9
     ldy #0  ; number of set bits
 @loop:
     dex