tree schema MAINTENANCE split source files to keep smaller files to work with
diff --git a/tests/src/test_tree_schema_helpers.c b/tests/src/test_tree_schema_helpers.c
index 580d488..29b7e8c 100644
--- a/tests/src/test_tree_schema_helpers.c
+++ b/tests/src/test_tree_schema_helpers.c
@@ -17,6 +17,7 @@
 #include "../../src/set.c"
 #include "../../src/parser_yang.c"
 #include "../../src/tree_schema.c"
+#include "../../src/tree_schema_free.c"
 #include "../../src/tree_schema_helpers.c"
 #include "../../src/hash_table.c"
 #include "../../src/xpath.c"