tree schema FEATURE new helper functions
diff --git a/src/tree_schema_helpers.c b/src/tree_schema_helpers.c
index 0bde0eb..e5953fc 100644
--- a/src/tree_schema_helpers.c
+++ b/src/tree_schema_helpers.c
@@ -2192,7 +2192,7 @@
     return LY_ARRAY_COUNT(ext);
 }
 
-const struct lysc_node *
+LIBYANG_API_DEF const struct lysc_node *
 lysc_data_node(const struct lysc_node *schema)
 {
     const struct lysc_node *parent;