diff --git a/test/threadsafe_attributes_test.rb b/test/threadsafe_attributes_test.rb
index d4a92496a5..78e96d6e24 100644
--- a/test/threadsafe_attributes_test.rb
+++ b/test/threadsafe_attributes_test.rb
@@ -35,4 +35,12 @@ class TestClass
     assert_equal "a value", @tester.safeattr
   end
 
+  test "#threadsafe attributes inherit the value of the main thread when value is nil/false" do
+    @tester.safeattr = false
+    Thread.new do
+      assert @tester.safeattr_defined?
+      assert_equal false, @tester.safeattr
+    end.join
+    assert_equal false, @tester.safeattr
+  end
 end