diff --git a/zsnes/src/video/newgfx16.asm b/zsnes/src/video/newgfx16.asm
index 6d6e9aa7..39f995ed 100644
--- a/zsnes/src/video/newgfx16.asm
+++ b/zsnes/src/video/newgfx16.asm
@@ -1115,7 +1115,7 @@ NEWSYM newengine16b
     cmp byte[scrnon+1],0
     jne .notblack
 ;    mov byte[clinemainsub],1
-    mov byte[scadtng+eax],0
+    xor byte[scadtng+eax],1
 ;    mov byte[FillSubScr+eax],0
 .notblack