1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index d4b5c690eaa7..2dbd96cce2d8 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -129,7 +129,7 @@ int pci_assign_resource(struct pci_dev *dev, int resno)
         resource_size_t size, min, align;
         int ret;
 
-        size = res->end - res->start + 1;
+        size = resource_size(res);
         min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
 
         align = resource_alignment(res);