diff --git a/src/gba/renderers/video-software.c b/src/gba/renderers/video-software.c
index 814c5462c..5eb0cb842 100644
--- a/src/gba/renderers/video-software.c
+++ b/src/gba/renderers/video-software.c
@@ -216,7 +216,7 @@ static void _drawBackgroundMode0(struct GBAVideoSoftwareRenderer* renderer, stru
 	for (int outX = start; outX < end; ++outX) {
 		xBase = (outX + inX) & 0xF8;
 		if (background->size & 1) {
-			xBase += ((outX + inX) & 0x100) << 3;
+			xBase += ((outX + inX) & 0x100) << 5;
 		}
 		screenBase = (background->screenBase >> 1) + (xBase >> 3) + (yBase << 2);
 		mapData.packed = renderer->d.vram[screenBase];