diff --git a/sorteerhoed/central_management.py b/sorteerhoed/central_management.py
index 97327f6..cb2734b 100644
--- a/sorteerhoed/central_management.py
+++ b/sorteerhoed/central_management.py
@@ -326,7 +326,8 @@ class CentralManagement():
                             sqsHit = self.currentHit
                             updateStatus = True
                             
-                        sqsAssignment = sqsHit.getAssignmentById(signal.params['event']['AssignmentId'])
+                        assId = signal.params['event']['AssignmentId'] + '_' + signal.params['event']['WorkerId']
+                        sqsAssignment = sqsHit.getAssignmentById(assId)
                         if not sqsAssignment:
                             self.logger.critical(f"Invalid assignmentId given for hit: {signal.params['event']}")
                             continue
diff --git a/sorteerhoed/webserver.py b/sorteerhoed/webserver.py
index 14b691d..c6353f1 100644
--- a/sorteerhoed/webserver.py
+++ b/sorteerhoed/webserver.py
@@ -75,7 +75,10 @@ class WebSocketHandler(tornado.websocket.WebSocketHandler):
 
         self.hit = self.store.currentHit
 
+        # my core assumption about assignment_id was wrong. It is not unique per worker, so we need to merge those
         self.assignment_id = str(self.get_query_argument('assignmentId'))
+        self.assignment_id += '_' + str(self.get_query_argument('workerId'))
+        
         self.assignment = self.hit.getLastAssignment()
         
         if self.assignment.assignment_id != self.assignment_id:
@@ -317,6 +320,9 @@ class DrawPageHandler(tornado.web.RequestHandler):
                 return
 
             assignmentId = self.get_query_argument('assignmentId', '')
+            if len(assignmentId):
+                assignmentId += '_' + str(self.get_query_argument('workerId', ''))
+            
             if len(assignmentId) < 1:
                 logger.critical("Accessing page without assignment id. Allowing it for debug purposes... fingers crossed?")