diff --git a/drivers/parisc/iommu.h b/drivers/parisc/iommu.h
index d6fd3ab899ac..240059cd8185 100644
--- a/drivers/parisc/iommu.h
+++ b/drivers/parisc/iommu.h
@@ -6,7 +6,7 @@
 struct parisc_device;
 struct ioc;
 
-static inline void *parisc_walk_tree(struct device *dev)
+static inline struct pci_hba_data *parisc_walk_tree(struct device *dev)
 {
 	struct device *otherdev;