diff --git a/src/test/test_driver.c b/src/test/test_driver.c
index 3b22cf6546..9918d2c4b0 100644
--- a/src/test/test_driver.c
+++ b/src/test/test_driver.c
@@ -521,6 +521,7 @@ testDomainGenerateIfname(virDomainDefPtr domdef)
 
         if (!found)
             return ifname;
+        VIR_FREE(ifname);
     }
 
     virReportError(VIR_ERR_INTERNAL_ERROR,