diff --git a/src/hw.accel.a b/src/hw.accel.a
index 5c2763be9..9906c4456 100644
--- a/src/hw.accel.a
+++ b/src/hw.accel.a
@@ -360,7 +360,7 @@ addon
          sta   zc_lock,x  ; disable/enable
          lda   #ZC_LOCK
          sta   zc_lock
-         sta   $C05B     ; fix colouring
+         sta   $C05D     ; fix colouring
 
 FASTChip
          lda   #FC_UNLOCK