diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c
index 90e0b6f134ad..23d7f73cc347 100644
--- a/drivers/pci/host/pci-mvebu.c
+++ b/drivers/pci/host/pci-mvebu.c
@@ -1236,7 +1236,7 @@ static int mvebu_pcie_probe(struct platform_device *pdev)
 		pcie->realio.start = PCIBIOS_MIN_IO;
 		pcie->realio.end = min_t(resource_size_t,
 					 IO_SPACE_LIMIT,
-					 resource_size(&pcie->io));
+					 resource_size(&pcie->io) - 1);
 	} else
 		pcie->realio = pcie->io;