diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
index 3d5da7f44378..ba52459928f7 100644
--- a/drivers/pci/switch/switchtec.c
+++ b/drivers/pci/switch/switchtec.c
@@ -1484,7 +1484,7 @@ static void init_pff(struct switchtec_dev *stdev)
 {
 	int i;
 	u32 reg;
-	struct part_cfg_regs *pcfg = stdev->mmio_part_cfg;
+	struct part_cfg_regs __iomem *pcfg = stdev->mmio_part_cfg;
 
 	for (i = 0; i < SWITCHTEC_MAX_PFF_CSR; i++) {
 		reg = ioread16(&stdev->mmio_pff_csr[i].vendor_id);