diff --git a/src/pydase/observer_pattern/observer/property_observer.py b/src/pydase/observer_pattern/observer/property_observer.py
index 0e8ae4c..a686765 100644
--- a/src/pydase/observer_pattern/observer/property_observer.py
+++ b/src/pydase/observer_pattern/observer/property_observer.py
@@ -100,7 +100,7 @@ class PropertyObserver(Observer):
         elif isinstance(collection, dict):
             for key, val in collection.items():
                 if isinstance(val, Observable):
-                    new_prefix = f"{parent_path}['{key}']"
+                    new_prefix = f'{parent_path}["{key}"]'
                     deps.update(
                         self._get_properties_and_their_dependencies(val, new_prefix)
                     )
diff --git a/tests/data_service/test_data_service_observer.py b/tests/data_service/test_data_service_observer.py
index 347ff54..9b7e7e9 100644
--- a/tests/data_service/test_data_service_observer.py
+++ b/tests/data_service/test_data_service_observer.py
@@ -167,8 +167,8 @@ def test_normalized_attr_path_in_dependent_property_changes(
     state_manager = StateManager(service=service_instance)
     observer = DataServiceObserver(state_manager=state_manager)
 
-    assert observer.property_deps_dict["service_dict['one']._prop"] == [
-        "service_dict['one'].prop"
+    assert observer.property_deps_dict['service_dict["one"]._prop'] == [
+        'service_dict["one"].prop'
     ]
 
     # We can use dict key path encoded with double quotes