diff --git a/arch/powerpc/kernel/iomap.c b/arch/powerpc/kernel/iomap.c
index 2a5cf868037083b6695670f5d99d1d6100daa5a4..1577434f4088599b4243c96b94a14247397f682f 100644
--- a/arch/powerpc/kernel/iomap.c
+++ b/arch/powerpc/kernel/iomap.c
@@ -119,8 +119,8 @@ EXPORT_SYMBOL(ioport_unmap);
 
 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max)
 {
-	unsigned long start = pci_resource_start(dev, bar);
-	unsigned long len = pci_resource_len(dev, bar);
+	resource_size_t start = pci_resource_start(dev, bar);
+	resource_size_t len = pci_resource_len(dev, bar);
 	unsigned long flags = pci_resource_flags(dev, bar);
 
 	if (!len)