diff --git a/core/type.c b/core/type.c
index 79ebbee..23e594a 100644
--- a/core/type.c
+++ b/core/type.c
@@ -38,7 +38,8 @@ B_BTREE_DEFINE_INSERT(
 	struct b_type_component, c_node, &c_type->r_info->t_id,
 	put_type_component, component_compare)
 
-struct b_type_registration *get_type(const b_btree *tree, const union b_type *key)
+static struct b_type_registration *get_type(
+	const b_btree *tree, const union b_type *key)
 {
 	b_btree_node *cur = tree->b_root;
 	while (cur) {