diff --git a/lib/krb5/transited.c b/lib/krb5/transited.c
index b80578f69..a9b34dfc6 100644
--- a/lib/krb5/transited.c
+++ b/lib/krb5/transited.c
@@ -310,7 +310,7 @@ krb5_domain_x500_decode(krb5_context context,
     
     if(tr.length == 0) {
 	*realms = NULL;
-	num_realms = 0;
+	*num_realms = 0;
 	return 0;
     }