diff --git a/src/duk_hthread_builtins.c b/src/duk_hthread_builtins.c
index 8c2d941c..81ef82b8 100644
--- a/src/duk_hthread_builtins.c
+++ b/src/duk_hthread_builtins.c
@@ -106,6 +106,11 @@ void duk_hthread_create_builtin_objects(duk_hthread *thr) {
 			h = duk_require_hobject(ctx, -1);
 			DUK_ASSERT(h != NULL);
 
+			/* Currently all built-in native functions are strict. */
+			DUK_HOBJECT_SET_STRICT(h);
+
+			/* FIXME: function name */
+
 			/* Almost all global level Function objects are constructable
 			 * but not all: Function.prototype is a non-constructable,
 			 * callable Function.
@@ -355,6 +360,8 @@ void duk_hthread_create_builtin_objects(duk_hthread *thr) {
 			h_func = duk_require_hnativefunction(ctx, -1);
 			h_func = h_func;  /* suppress warning (not referenced now) */
 
+			/* FIXME: function name */
+
 			/* Currently all built-in native functions are strict.
 			 * This doesn't matter for many functions, but e.g.
 			 * String.prototype.charAt (and other string functions)