diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index efd8525..044babe 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -1426,9 +1426,9 @@
 	return phys_addr;
 }
 
-int _dm_pci_phys_to_bus(struct udevice *dev, phys_addr_t phys_addr,
-			unsigned long flags, unsigned long skip_mask,
-			pci_addr_t *ba)
+static int _dm_pci_phys_to_bus(struct udevice *dev, phys_addr_t phys_addr,
+			       unsigned long flags, unsigned long skip_mask,
+			       pci_addr_t *ba)
 {
 	struct pci_region *res;
 	struct udevice *ctlr;