diff --git a/backend/core/views.py b/backend/core/views.py
index 7a95fc88..d0bd9634 100644
--- a/backend/core/views.py
+++ b/backend/core/views.py
@@ -307,7 +307,7 @@ class ApprovedPredictionsViewSet(viewsets.ModelViewSet):
     def create(self, request, *args, **kwargs):
         training_id = request.data.get("training")
         geom = request.data.get("geom")
-        request.data["approved_by"] = self.request.user
+        request.data["approved_by"] = self.request.user.osm_id
 
         existing_approved_feature = ApprovedPredictions.objects.filter(
             training=training_id, geom=geom