diff --git a/src/lyb.h b/src/lyb.h
index 30e89fd..e56457d 100644
--- a/src/lyb.h
+++ b/src/lyb.h
@@ -66,6 +66,7 @@
     uint32_t path_len;             /**< used bytes in the path buffer */
     char path[LYD_PARSER_BUFSIZE]; /**< buffer for the generated path */
     struct ly_set node_when;       /**< set of nodes with "when" conditions */
+    struct ly_set node_exts;       /**< set of nodes and extensions connected with a plugin providing own validation callback */
     struct ly_set node_types;      /**< set of nodes validated with LY_EINCOMPLETE result */
     struct ly_set meta_types;      /**< set of metadata validated with LY_EINCOMPLETE result */
     struct lyd_node *op_node;      /**< if an RPC/action/notification is being parsed, store the pointer to it */