diff --git a/src/northbridge/intel/i945/gma.c b/src/northbridge/intel/i945/gma.c
index 7fcd670..e40b9f0 100644
--- a/src/northbridge/intel/i945/gma.c
+++ b/src/northbridge/intel/i945/gma.c
@@ -275,7 +275,7 @@
 	write32(pmmio + VBLANK(1), ((vactive + bottom_border + vblank - 1) << 16)
 		| (vactive + bottom_border - 1));
 	write32(pmmio + VSYNC(1),
-		(vactive + bottom_border + vfront_porch + vsync - 1)
+		((vactive + bottom_border + vfront_porch + vsync - 1) << 16)
 		| (vactive + bottom_border + vfront_porch - 1));
 
 #if !IS_ENABLED(CONFIG_FRAMEBUFFER_KEEP_VESA_MODE)