diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 744e4e6b8d72..9918af222c51 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -2411,7 +2411,7 @@ static int __init si_domain_init(int hw)
 		for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) {
 			ret = iommu_domain_identity_map(si_domain,
 					mm_to_dma_pfn_start(start_pfn),
-					mm_to_dma_pfn_end(end_pfn));
+					mm_to_dma_pfn_end(end_pfn-1));
 			if (ret)
 				return ret;
 		}