diff --git a/selfprivacy_api/services/service.py b/selfprivacy_api/services/service.py
index dc7579d..a53c028 100644
--- a/selfprivacy_api/services/service.py
+++ b/selfprivacy_api/services/service.py
@@ -128,7 +128,12 @@ class Service(ABC):
 
     @classmethod
     def is_enabled(cls) -> bool:
-        """`True` if the service is enabled."""
+        """
+        `True` if the service is enabled.
+        `False` if it is not enabled or not defined in file
+        If there is nothing in the file, this is equivalent to False
+        because NixOS won't enable it then.
+        """
         name = cls.get_id()
         with ReadUserData() as user_data:
             return user_data.get(name, {}).get("enable", False)
diff --git a/tests/test_graphql/test_services.py b/tests/test_graphql/test_services.py
index 8a88ef7..f28f204 100644
--- a/tests/test_graphql/test_services.py
+++ b/tests/test_graphql/test_services.py
@@ -557,6 +557,25 @@ def possibly_dubiously_enabled_service(
     return dummy_service
 
 
+# Yeah, idk yet how to dry it.
+@pytest.fixture(params=["deleted_attribute", "service_not_in_json"])
+def undefined_enabledness_service(dummy_service: DummyService, request) -> DummyService:
+    if request.param == "deleted_attribute":
+        with WriteUserData() as data:
+            del data[dummy_service.get_id()]["enable"]
+    if request.param == "service_not_in_json":
+        with WriteUserData() as data:
+            del data[dummy_service.get_id()]
+    return dummy_service
+
+
+def test_undefined_enabledness_in_json_means_False(
+    undefined_enabledness_service: DummyService,
+):
+    dummy_service = undefined_enabledness_service
+    assert dummy_service.is_enabled() is False
+
+
 def test_enabling_disabling_writes_json(
     possibly_dubiously_enabled_service: DummyService,
 ):