diff --git a/zsnes/src/video/newgfx16.asm b/zsnes/src/video/newgfx16.asm
index de59a745..e35a95c6 100644
--- a/zsnes/src/video/newgfx16.asm
+++ b/zsnes/src/video/newgfx16.asm
@@ -3536,6 +3536,7 @@ NEWSYM NewGfx16AsmEnd
     je near .outsideclipping
     mov edi,ngwintable
     mov ecx,[edi]
+    dec ecx
     add edi,4
     or ecx,ecx
     jnz near .startclippingb