diff --git a/src/gxfb.c b/src/gxfb.c
index d082f11..e78d3f3 100644
--- a/src/gxfb.c
+++ b/src/gxfb.c
@@ -211,8 +211,12 @@ int fb_init(GXRModeObj *rmode, int width, int height) {
 		return 1;
 	if (width <= 0 || width > (rmode->fbWidth / 2))
 		return 1;
+	if (width % 4)
+		return 1;
 	if (height <= 0 || height > rmode->efbHeight)
 		return 1;
+	if (height % 4)
+		return 1;
 
 	video_init(rmode);