diff --git a/include/linux/dma_remapping.h b/include/linux/dma_remapping.h
index aaa12cb..b98b61b 100644
--- a/include/linux/dma_remapping.h
+++ b/include/linux/dma_remapping.h
@@ -30,6 +30,7 @@
 extern void free_dmar_iommu(struct intel_iommu *iommu);
 extern int iommu_calculate_agaw(struct intel_iommu *iommu);
 extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
+extern int dmar_disabled;
 #else
 static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
 {
@@ -42,8 +43,8 @@
 static inline void free_dmar_iommu(struct intel_iommu *iommu)
 {
 }
+#define dmar_disabled	(1)
 #endif
 
-extern int dmar_disabled;
 
 #endif