diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 9aad782f19..ccd3bdf64a 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -2490,7 +2490,7 @@ virDomainObjListAddLocked(virDomainObjListPtr doms,
     char uuidstr[VIR_UUID_STRING_BUFLEN];
 
     if (oldDef)
-        *oldDef = false;
+        *oldDef = NULL;
 
     virUUIDFormat(def->uuid, uuidstr);