diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index be35284a20160..65c2ed7600601 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -564,7 +564,7 @@ static inline int domain_pfn_supported(struct dmar_domain *domain,
 static int __iommu_calculate_agaw(struct intel_iommu *iommu, int max_gaw)
 {
 	unsigned long sagaw;
-	int agaw = -1;
+	int agaw;
 
 	sagaw = cap_sagaw(iommu->cap);
 	for (agaw = width_to_agaw(max_gaw);