diff --git a/desktop/desktop_main.s b/desktop/desktop_main.s
index d8f8485..9d2afd4 100644
--- a/desktop/desktop_main.s
+++ b/desktop/desktop_main.s
@@ -14855,7 +14855,7 @@ reset_grafport3a:
         jsr     ID_BYTE_FE1F
         bcs     done
         lda     NEWVIDEO
-        ora     #<~(1<<5)       ; Color
+        and     #<~(1<<5)       ; Color
         sta     NEWVIDEO
 
 done:   rts