wrap around the palette value

1 files changed, 1 insertions, 1 deletions

diff --git a/src/ppu.rs b/src/ppu.rs
index 095e3e1..faf0664 100644
--- a/src/ppu.rs
+++ b/src/ppu.rs
@@ -440,7 +440,7 @@ impl<'a> PPU<'a> {
                             0 => 0,
                             _ => bg
                         }
-                     }));
+                     }) & 0x3f);
     }
 
     pub fn new(mem: PPUMemory<'a>, scr: &'a mut Screen) -> Self {