diff --git a/src/interface/interface_backend_udev.c b/src/interface/interface_backend_udev.c
index 10b8a5d3d0..d2590434bd 100644
--- a/src/interface/interface_backend_udev.c
+++ b/src/interface/interface_backend_udev.c
@@ -577,7 +577,7 @@ udevIfaceGetIfaceDef(struct udev *udev, char *name)
 
     /* MAC address */
     ifacedef->mac = strdup(udev_device_get_sysattr_value(dev, "address"));
-    if (!ifacedef) {
+    if (!ifacedef->mac) {
         virReportOOMError();
         goto cleanup;
     }