diff --git a/src/kernel/environment.h b/src/kernel/environment.h
index 39678fe1f3..9a86b45170 100644
--- a/src/kernel/environment.h
+++ b/src/kernel/environment.h
@@ -29,7 +29,7 @@ class type_checker;
 class environment;
 class certified_declaration;
 
-typedef std::function<bool(name const &)> extra_opaque_pred;
+typedef std::function<bool(name const &)> extra_opaque_pred; // NOLINT
 extra_opaque_pred const & no_extra_opaque();
 
 /**
diff --git a/src/library/kernel_bindings.cpp b/src/library/kernel_bindings.cpp
index 2b9166e34d..d94ab9a900 100644
--- a/src/library/kernel_bindings.cpp
+++ b/src/library/kernel_bindings.cpp
@@ -1842,8 +1842,8 @@ static int mk_type_checker(lua_State * L) {
         return push_type_checker_ref(L, std::make_shared<type_checker>(to_environment(L, 1), to_name_generator(L, 2)));
     } else {
         optional<module_idx> mod_idx; bool memoize; name_set extra_opaque;
-        extra_opaque_pred pred([=](name const & n) { return extra_opaque.contains(n); });
         get_type_checker_args(L, 3, mod_idx, memoize, extra_opaque);
+        extra_opaque_pred pred([=](name const & n) { return extra_opaque.contains(n); });
         auto t = std::make_shared<type_checker>(to_environment(L, 1), to_name_generator(L, 2),
                                                 mk_default_converter(to_environment(L, 1), mod_idx, memoize, pred),
                                                 memoize);
diff --git a/tests/lua/env5.lua b/tests/lua/env5.lua
index 75746d8d14..e2e9ef9223 100644
--- a/tests/lua/env5.lua
+++ b/tests/lua/env5.lua
@@ -56,5 +56,6 @@ assert(not pcall(function() print(tc2:check(id_1(Type, a))) end))
 assert(tc2:whnf(id_2(Type, a)) == a)
 assert(tc2:whnf(id_2(Type, id_2(Type, a))) == a)
 local tc3 = type_checker(env, name_generator("foo"), {extra_opaque=name_set("id")})
+print(tc3:whnf(id_2(Type, id_2(Type, a))))
 assert(tc3:whnf(id_2(Type, id_2(Type, a))) == id_2(Type, id_2(Type, a)))
 print(id_2(Type, id_2(Type, a)))