diff --git a/arch/mips/pci/pci.c b/arch/mips/pci/pci.c
index f6325fa657fb..64ae8c094a54 100644
--- a/arch/mips/pci/pci.c
+++ b/arch/mips/pci/pci.c
@@ -55,7 +55,7 @@ void pci_resource_to_user(const struct pci_dev *dev, int bar,
 	phys_addr_t size = resource_size(rsrc);
 
 	*start = fixup_bigphys_addr(rsrc->start, size);
-	*end = rsrc->start + size;
+	*end = rsrc->start + size - 1;
 }
 
 int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,