diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index 9aa224f2f009..05f863435e5e 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -1218,10 +1218,10 @@ static int mvebu_pcie_probe(struct platform_device *pdev)
 		pcie->realio.flags = pcie->io.flags;
 		pcie->realio.start = PCIBIOS_MIN_IO;
 		pcie->realio.end = min_t(resource_size_t,
-					 IO_SPACE_LIMIT,
+					 IO_SPACE_LIMIT - SZ_64K,
 					 resource_size(&pcie->io) - 1);
 
-		for (i = 0; i < (IO_SPACE_LIMIT - SZ_64K); i += SZ_64K)
+		for (i = 0; i < resource_size(&pcie->realio); i += SZ_64K)
 			pci_ioremap_io(i, pcie->io.start + i);
 	} else
 		pcie->realio = pcie->io;