diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 869f37d1..53227d6 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -64,7 +64,7 @@
 #define IOAPIC_RANGE_END	(0xfeefffff)
 #define IOVA_START_ADDR		(0x1000)
 
-#define DEFAULT_DOMAIN_ADDRESS_WIDTH 48
+#define DEFAULT_DOMAIN_ADDRESS_WIDTH 57
 
 #define MAX_AGAW_WIDTH 64
 #define MAX_AGAW_PFN_WIDTH	(MAX_AGAW_WIDTH - VTD_PAGE_SHIFT)