diff --git a/src/conf/domain_nwfilter.c b/src/conf/domain_nwfilter.c
index 948b32481ecdcb6a42fcbe0095eacd0fb599dec8..24b5f42ddd510a8f44b80fbfa52aa2bc4f6999d7 100644
--- a/src/conf/domain_nwfilter.c
+++ b/src/conf/domain_nwfilter.c
@@ -90,7 +90,7 @@ virDomainConfNWFilterInstantiate(const char *vmname,
     virConnectPtr conn = virGetConnectNWFilter();
     virNWFilterBindingDefPtr def = NULL;
     virNWFilterBindingPtr binding = NULL;
-    char *xml;
+    char *xml = NULL;
     int ret = -1;
 
     VIR_DEBUG("vmname=%s portdev=%s filter=%s ignoreExists=%d",