diff --git a/hw/pci/pci_bridge.c b/hw/pci/pci_bridge.c
index ee9dff2d3a..b9143ac88b 100644
--- a/hw/pci/pci_bridge.c
+++ b/hw/pci/pci_bridge.c
@@ -241,9 +241,9 @@ void pci_bridge_update_mappings(PCIBridge *br)
      * while another accesses an unaffected region. */
     memory_region_transaction_begin();
     pci_bridge_region_del(br, br->windows);
+    pci_bridge_region_cleanup(br, w);
     br->windows = pci_bridge_region_init(br);
     memory_region_transaction_commit();
-    pci_bridge_region_cleanup(br, w);
 }
 
 /* default write_config function for PCI-to-PCI bridge */