diff --git a/src/ppu.h b/src/ppu.h
index ee5a1e3..fac089c 100644
--- a/src/ppu.h
+++ b/src/ppu.h
@@ -49,7 +49,7 @@ struct nes_cart_t;
 
 #define nes_ppu_frame_cycles    (nes_ppu_dots * nes_ppu_frame)
 
-#define nes_ppu_scan_w  (320U) // Effective NTSC horizontal rez
+#define nes_ppu_scan_w  (292U)
 #define nes_ppu_scan_h  nes_ppu_height
 
 #define nes_ppu_blocks_w    (32U)