diff --git a/server/workers/workers_8/worker.py b/server/workers/workers_8/worker.py
index b9cf39c..48fa12b 100755
--- a/server/workers/workers_8/worker.py
+++ b/server/workers/workers_8/worker.py
@@ -92,7 +92,7 @@ if __name__ == "__main__":
                 if id and data:
                     # reconstruct data
                     if buffer != b'':
-                        data[b'message'] = '{}{}'.format(buffer, data[b'message'])
+                        data[b'message'] = b'{}{}'.format(buffer, data[b'message'])
                         buffer = b''
 
                     # send data to redis