diff --git a/src/supplemental/nanolib/mqtt_db.c b/src/supplemental/nanolib/mqtt_db.c
index 3c4a4af9e..3d8bfd197 100644
--- a/src/supplemental/nanolib/mqtt_db.c
+++ b/src/supplemental/nanolib/mqtt_db.c
@@ -905,9 +905,8 @@ delete_dbtree_node(dbtree_node *node, size_t index)
 		log_debug("Delete node: [%s]", node_t->topic);
 		cvector_free(node_t->child);
 		cvector_free(node_t->clients);
-		free(node_t->topic);
 		cvector_erase(node->child, index);
-		free(node_t);
+		dbtree_node_free(node_t);
 		node_t = NULL;
 		if (index == 0) {
 			if (node->plus >= 0) {