diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index ad2b280c6f480015d6dd4dfdb3ca8945b05ce741..3689ac0a82ce582f13e9cb5da065c744ea7a9556 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -15737,6 +15737,7 @@ virDomainMemoryDefParseXML(virDomainXMLOptionPtr xmlopt,
 
         def->discard = val;
     }
+    VIR_FREE(tmp);
 
     /* source */
     if ((node = virXPathNode("./source", ctxt)) &&