diff --git a/video.c b/video.c
index b41f6e7..1dd4d21 100644
--- a/video.c
+++ b/video.c
@@ -4530,11 +4530,14 @@ void update_scanline(void)
         render_scanline_bitmap(screen_offset, dispcnt);
     }
   }
-
-  affine_reference_x[0] += (s16)read_ioreg(REG_BG2PB);
-  affine_reference_y[0] += (s16)read_ioreg(REG_BG2PD);
-  affine_reference_x[1] += (s16)read_ioreg(REG_BG3PB);
-  affine_reference_y[1] += (s16)read_ioreg(REG_BG3PD);
+  // Don't update background scanline params in mode 0
+  if(video_mode != 0)
+  {
+    affine_reference_x[0] += (s16)read_ioreg(REG_BG2PB);
+    affine_reference_y[0] += (s16)read_ioreg(REG_BG2PD);
+    affine_reference_x[1] += (s16)read_ioreg(REG_BG3PB);
+    affine_reference_y[1] += (s16)read_ioreg(REG_BG3PD);
+  }
 }