diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 0a85199191b9377fbdd89ee1d7e69e3b1e0df76d..7e83370e6fd2b134691e7fa348529e70d0a1ae56 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -31,6 +31,7 @@ struct iommu_group;
 struct bus_type;
 struct device;
 struct iommu_domain;
+struct notifier_block;
 
 /* iommu fault flags */
 #define IOMMU_FAULT_READ	0x0