diff --git a/unittests/dynamic_object_dynamic_attrs_explicit.chai b/unittests/dynamic_object_dynamic_attrs_explicit.chai
new file mode 100644
index 0000000..b26b610
--- /dev/null
+++ b/unittests/dynamic_object_dynamic_attrs_explicit.chai
@@ -0,0 +1,14 @@
+
+class MyClass {
+  def MyClass()
+  {
+    this.set_explicit(true);
+  }
+};
+
+var o = MyClass();
+
+assert_true(o.is_explicit());
+
+assert_throws(fun[o](){o.x = 2})
+