diff --git a/src/xfel_calibrate/calibrate.py b/src/xfel_calibrate/calibrate.py
index 6f4138507830a831da0ca78adbcb10423784a65e..19f46fdef2644cd8e831c31fb1d94d873c82a1f4 100755
--- a/src/xfel_calibrate/calibrate.py
+++ b/src/xfel_calibrate/calibrate.py
@@ -591,7 +591,7 @@ def run(argv=None):
 
     title = title.rstrip()
 
-    run_uuid = f"t{datetime.now().strftime('%y%m%d_%H%M%S')}"
+    run_uuid = f"t{datetime.now().strftime('%y%m%d_%H%M%S.%f')}"
 
     # check if concurrency parameter is given and we run concurrently
     if concurrency_par is not None and not any(