diff --git a/src/northbridge/intel/haswell/northbridge.c b/src/northbridge/intel/haswell/northbridge.c
index a8c8015..32be916 100644
--- a/src/northbridge/intel/haswell/northbridge.c
+++ b/src/northbridge/intel/haswell/northbridge.c
@@ -36,6 +36,7 @@
 static int get_pcie_bar(device_t dev, unsigned int index, u32 *base, u32 *len)
 {
 	u32 pciexbar_reg;
+	u32 mask;
 
 	*base = 0;
 	*len = 0;
@@ -47,15 +48,20 @@
 
 	switch ((pciexbar_reg >> 1) & 3) {
 	case 0: // 256MB
-		*base = pciexbar_reg & ((1 << 31)|(1 << 30)|(1 << 29)|(1 << 28));
+		mask = (1UL << 31) | (1 << 30) | (1 << 29) | (1 << 28);
+		*base = pciexbar_reg & mask;
 		*len = 256 * 1024 * 1024;
 		return 1;
 	case 1: // 128M
-		*base = pciexbar_reg & ((1 << 31)|(1 << 30)|(1 << 29)|(1 << 28)|(1 << 27));
+		mask = (1UL << 31) | (1 << 30) | (1 << 29) | (1 << 28);
+		mask |= (1 << 27);
+		*base = pciexbar_reg & mask;
 		*len = 128 * 1024 * 1024;
 		return 1;
 	case 2: // 64M
-		*base = pciexbar_reg & ((1 << 31)|(1 << 30)|(1 << 29)|(1 << 28)|(1 << 27)|(1 << 26));
+		mask = (1UL << 31) | (1 << 30) | (1 << 29) | (1 << 28);
+		mask |= (1 << 27) | (1 << 26);
+		*base = pciexbar_reg & mask;
 		*len = 64 * 1024 * 1024;
 		return 1;
 	}