diff --git a/arkindex_worker/worker/base.py b/arkindex_worker/worker/base.py
index a893689c4d51e291a1c6c19ca704f6195f6e0136..f892558e4254f9f0255ff036e62fc9557b2206c6 100644
--- a/arkindex_worker/worker/base.py
+++ b/arkindex_worker/worker/base.py
@@ -215,15 +215,14 @@ class BaseWorker(object):
 
         # Load worker run configuration when available
         worker_configuration = worker_run.get("configuration")
-        self.user_configuration = (
-            worker_configuration.get("configuration") if worker_configuration else None
-        )
-        if self.user_configuration:
+        if worker_configuration and worker_configuration.get("configuration"):
             logger.info("Loaded user configuration from WorkerRun")
-            # if debug mode is set to true activate debug mode in logger
-            if self.user_configuration.get("debug"):
-                logger.setLevel(logging.DEBUG)
-                logger.debug("Debug output enabled")
+            self.user_configuration.update(worker_configuration.get("configuration"))
+
+        # if debug mode is set to true activate debug mode in logger
+        if self.user_configuration.get("debug"):
+            logger.setLevel(logging.DEBUG)
+            logger.debug("Debug output enabled")
 
     def configure_cache(self):
         task_id = os.environ.get("PONOS_TASK")
diff --git a/tests/test_base_worker.py b/tests/test_base_worker.py
index 90b89736dd153760e27b5aa392dacc48d433854c..6239c81b27495f3892d6376caa1b10eebad55b2a 100644
--- a/tests/test_base_worker.py
+++ b/tests/test_base_worker.py
@@ -249,7 +249,15 @@ def test_configure_user_configuration_defaults(
             },
             "revision": {"hash": "deadbeef1234"},
             "configuration": {
-                "configuration": {"param_1": "/some/path/file.pth", "param_2": 12}
+                "configuration": {"param_1": "/some/path/file.pth", "param_2": 12},
+                "user_configuration": {
+                    "integer_parameter": {
+                        "type": "int",
+                        "title": "Lambda",
+                        "default": 0,
+                        "required": False,
+                    }
+                },
             },
         },
         "configuration": {
@@ -277,6 +285,7 @@ def test_configure_user_configuration_defaults(
 
     assert worker.config == {"param_1": "/some/path/file.pth", "param_2": 12}
     assert worker.user_configuration == {
+        "integer_parameter": 0,
         "param_3": "Animula vagula blandula",
         "param_5": True,
     }
@@ -381,7 +390,7 @@ def test_configure_worker_run_missing_conf(mocker, monkeypatch, responses):
     worker.args = worker.parser.parse_args()
     worker.configure()
 
-    assert worker.user_configuration is None
+    assert worker.user_configuration == {}
 
 
 def test_configure_worker_run_no_worker_run_conf(mocker, monkeypatch, responses):
@@ -431,7 +440,7 @@ def test_configure_worker_run_no_worker_run_conf(mocker, monkeypatch, responses)
     worker.args = worker.parser.parse_args()
     worker.configure()
 
-    assert worker.user_configuration is None
+    assert worker.user_configuration == {}
 
 
 def test_load_missing_secret():