diff --git a/src/northbridge/intel/sandybridge/northbridge.c b/src/northbridge/intel/sandybridge/northbridge.c
index 14fde8b0..521044b 100644
--- a/src/northbridge/intel/sandybridge/northbridge.c
+++ b/src/northbridge/intel/sandybridge/northbridge.c
@@ -85,7 +85,7 @@
 {
 	uint64_t touud = pci_read_config32(dev, TOUUD + 4);
 	touud <<= 32;
-	touud |= pci_read_config32(dev, TOUUD);
+	touud |= pci_read_config32(dev, TOUUD) & 0xfff00000;
 	return touud;
 }