diff --git a/zsnes/src/video/newgfx16.asm b/zsnes/src/video/newgfx16.asm
index d801e5da..fbe069d7 100644
--- a/zsnes/src/video/newgfx16.asm
+++ b/zsnes/src/video/newgfx16.asm
@@ -3536,19 +3536,23 @@ NEWSYM NewGfx16AsmEnd
     je near .outsideclipping
     mov edi,ngwintable
     mov ecx,[edi]
+    dec ecx
     add edi,4
     or ecx,ecx
     jnz near .startclippingb
     mov ecx,[edi]
+    dec ecx
     add edi,4
     jmp .noclipping
 .outsideclipping
     mov edi,ngwintable
     mov ecx,[edi]
+    dec ecx
     add edi,4
     or ecx,ecx
     jnz .noclipping
     mov ecx,[edi]
+    dec ecx
     add edi,4
     jmp .startclippingb
 .startclippingb