diff --git a/source3/winbindd/winbindd_dual.c b/source3/winbindd/winbindd_dual.c
index 360f1b2..ebda52a 100644
--- a/source3/winbindd/winbindd_dual.c
+++ b/source3/winbindd/winbindd_dual.c
@@ -1305,6 +1305,7 @@ static bool fork_domain_child(struct winbindd_child *child)
 	struct winbindd_request request;
 	struct winbindd_response response;
 	struct winbindd_domain *primary_domain = NULL;
+	struct winbindd_child *c;
 
 	if (child->domain) {
 		DEBUG(10, ("fork_domain_child called for domain '%s'\n",
@@ -1336,8 +1337,18 @@ static bool fork_domain_child(struct winbindd_child *child)
 		/* Parent */
 		close(fdpair[0]);
 		child->next = child->prev = NULL;
-		DLIST_ADD(children, child);
 		child->sock = fdpair[1];
+		/*
+		 * We need to check duplicate element before
+		 * DLIST_ADD. Otherwise, childlen list be circularly.
+		 */
+		for (c = children; c != NULL; c = child->next) {
+			if (c == child) {
+				DEBUG(5, ("Already added child in children\n");
+				return True;
+			}
+		}
+		DLIST_ADD(children, child);
 		return True;
 	}