diff --git a/demos/smb/ppu.s b/demos/smb/ppu.s
index 9dd63aa..a190c4b 100644
--- a/demos/smb/ppu.s
+++ b/demos/smb/ppu.s
@@ -619,7 +619,7 @@ scanOAMSprites
         beq    :skip
 
         lda    PPU_OAM+3,x       ; If X-coordinate is off the edge skip it, too.
-        cmp    #241
+        cmp    #255-8
         bcs    :skip
 
         rep    #$20