diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index ed113bf402..4fd9c532b3 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -323,7 +323,7 @@ int __pci_hose_bus_to_phys(struct pci_controller *hose,
 			continue;
 
 		if (bus_addr >= res->bus_start &&
-			bus_addr < res->bus_start + res->size) {
+			(bus_addr - res->bus_start) < res->size) {
 			*pa = (bus_addr - res->bus_start + res->phys_start);
 			return 0;
 		}