diff --git a/src/tree_schema_free.c b/src/tree_schema_free.c
index b7fe1a8..60a392b 100644
--- a/src/tree_schema_free.c
+++ b/src/tree_schema_free.c
@@ -84,7 +84,7 @@
     FREE_ARRAY(ctx, rev->exts, lysp_ext_instance_free);
 }
 
-static void
+void
 lysp_ext_free(struct ly_ctx *ctx, struct lysp_ext *ext)
 {
     FREE_STRING(ctx, ext->name);