diff --git a/drivers/mmc/pci_mmc.c b/drivers/mmc/pci_mmc.c
index 340eef6a1f..3d587cc97d 100644
--- a/drivers/mmc/pci_mmc.c
+++ b/drivers/mmc/pci_mmc.c
@@ -30,7 +30,7 @@ int pci_mmc_init(const char *name, struct pci_device_id *mmc_supported)
 
 		mmc_host->name = name;
 		dm_pci_read_config32(dev, PCI_BASE_ADDRESS_0, &iobase);
-		mmc_host->ioaddr = (void *)iobase;
+		mmc_host->ioaddr = (void *)(ulong)iobase;
 		mmc_host->quirks = 0;
 		ret = add_sdhci(mmc_host, 0, 0);
 		if (ret)