diff --git a/server/app/validation/__init__.py b/server/app/validation/__init__.py
index 50000589..58a40039 100644
--- a/server/app/validation/__init__.py
+++ b/server/app/validation/__init__.py
@@ -1,9 +1,9 @@
-from app.validation.mqtt import (
+from .mqtt import (
     AcknowledgementsMessage,
     LogsMessage,
     MeasurementsMessage,
 )
-from app.validation.routes import (
+from .routes import (
     CreateConfigurationRequest,
     CreateSensorRequest,
     CreateSessionRequest,
diff --git a/server/app/validation/types.py b/server/app/validation/types.py
index 7c4c2348..2cdf2990 100644
--- a/server/app/validation/types.py
+++ b/server/app/validation/types.py
@@ -19,6 +19,7 @@ class _Configuration(pydantic.BaseModel):
     # number of JSON fields or nesting depth could be interesting as well
     # Or, check the actual size of the JSON / length of the JSON string
     class Config:
+        extra = pydantic.Extra.allow
         frozen = True