diff --git a/hw/pci/msix.c b/hw/pci/msix.c
index 7716bf3649505034fed0cc0e064637ba8040843c..2fdada4e8f16f6c2afdbaa059349f84dac9dae79 100644
--- a/hw/pci/msix.c
+++ b/hw/pci/msix.c
@@ -314,9 +314,7 @@ int msix_init_exclusive_bar(PCIDevice *dev, unsigned short nentries,
         bar_size = bar_pba_offset + bar_pba_size;
     }
 
-    if (bar_size & (bar_size - 1)) {
-        bar_size = 1 << qemu_fls(bar_size);
-    }
+    bar_size = pow2ceil(bar_size);
 
     name = g_strdup_printf("%s-msix", dev->name);
     memory_region_init(&dev->msix_exclusive_bar, OBJECT(dev), name, bar_size);
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 9f57aeaebadc32eeb492bd79eb1d8da03e4e0bf1..4700e95206048faafa0854c19727b66d7f7e794d 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -2071,9 +2071,7 @@ static void pci_add_option_rom(PCIDevice *pdev, bool is_default_rom,
         g_free(path);
         return;
     }
-    if (size & (size - 1)) {
-        size = 1 << qemu_fls(size);
-    }
+    size = pow2ceil(size);
 
     vmsd = qdev_get_vmsd(DEVICE(pdev));