diff --git a/zsnes/src/gui/menu.asm b/zsnes/src/gui/menu.asm
index 4026a736..5003a5c4 100644
--- a/zsnes/src/gui/menu.asm
+++ b/zsnes/src/gui/menu.asm
@@ -1033,9 +1033,9 @@ NEWSYM pcxheader
 NEWSYM picnum, dw 0
 
 NEWSYM savepcx
-	cmp dword[ScreenShotFormat],1
-	jne .notpng
-	call Grab_PNG_Data
+        cmp byte[ScreenShotFormat],1
+        jne .notpng
+        call Grab_PNG_Data
 	ret
 .notpng