diff --git a/webservice/webservice.py b/webservice/webservice.py
index 33cb29c4369dec760d0e567aaee4d9c6f6a6f1c1..34da59a3d9f68f511f78e5383ca263ed67041fd1 100644
--- a/webservice/webservice.py
+++ b/webservice/webservice.py
@@ -1170,7 +1170,7 @@ class ActionsServer:
                     '--env-cache',
                     f'/gpfs/exfel/data/scratch/{getuser()}/calib-repeat-envs',
                     '--report-to',
-                    f'{reports_dir}/{karabo_id}_RECORRECT_{request_time:%y%m%d_%H%M%S.%f}'
+                    f'{reports_dir}/{karabo_id}_RECORRECT_{request_time:%y%m%d_%H%M%S_%f}'
                 ]
 
                 with time_db_transaction(self.job_db, 'Insert execution'):
@@ -1445,7 +1445,7 @@ class ActionsServer:
                 action=action, instrument=instrument,
                 cycle=cycle, proposal=proposal,
                 runs="_".join([f"r{r}" for r in run_nrs]),
-                time_stamp=request_time.strftime('%y%m%d_%H%M%S.%f'),
+                time_stamp=request_time.strftime('%y%m%d_%H%M%S_%f'),
                 det_instance=karabo_id,
                 request_time=request_time.isoformat(),
             ).split()