diff --git a/src/northbridge/intel/haswell/early_init.c b/src/northbridge/intel/haswell/early_init.c
index f426339..a2b0f7f 100644
--- a/src/northbridge/intel/haswell/early_init.c
+++ b/src/northbridge/intel/haswell/early_init.c
@@ -81,7 +81,7 @@
 
 	/* GPU RC6 workaround for sighting 366252 */
 	reg32 = MCHBAR32(0x5d14);
-	reg32 |= (1 << 31);
+	reg32 |= (1UL << 31);
 	MCHBAR32(0x5d14) = reg32;
 
 	/* VLW */