diff --git a/openslides/config/api.py b/openslides/config/api.py
index 07148c78d..676158e6f 100644
--- a/openslides/config/api.py
+++ b/openslides/config/api.py
@@ -177,6 +177,7 @@ class ConfigVariable:
         """
         data = {
             'key': self.name,
+            'default_value': self.default_value,
             'value': config[self.name],
             'input_type': self.input_type,
             'label': self.label,
diff --git a/tests/unit/config/__init__.py b/tests/unit/config/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/unit/config/test_api.py b/tests/unit/config/test_api.py
new file mode 100644
index 000000000..4685ec005
--- /dev/null
+++ b/tests/unit/config/test_api.py
@@ -0,0 +1,24 @@
+from unittest import TestCase
+from unittest.mock import patch
+
+from openslides.config.api import ConfigVariable
+
+
+class TestConfigVariable(TestCase):
+    @patch('openslides.config.api.config', {'test_variable': None})
+    def test_default_value_in_data(self):
+        """
+        Tests, that the default_value attribute is in the 'data' property of
+        a ConfigVariable instance.
+        """
+        config_variable = ConfigVariable('test_variable', 'test_default_value')
+
+        self.assertIn(
+            'default_value',
+            config_variable.data,
+            "Config_varialbe.data should have a key 'default_value'")
+        self.assertEqual(
+            config_variable.data['default_value'],
+            'test_default_value',
+            "The value of config_variable.data['default_value'] should be the same "
+            "as set as second argument of ConfigVariable()")