diff --git a/cmscontrib/ImportContest.py b/cmscontrib/ImportContest.py
index 9bc9713859..bc855ecc3b 100755
--- a/cmscontrib/ImportContest.py
+++ b/cmscontrib/ImportContest.py
@@ -296,12 +296,6 @@ def _participation_to_db(
             .filter(Participation.contest_id == contest.id)
             .first()
         )
-        # FIXME: detect if some details of the participation have been updated
-        # and thus the existing participation needs to be changed.
-        if p is not None:
-            logger.warning("Participation of user %s in this contest already "
-                           "exists, not updating it.", new_p["username"])
-            return p
 
         # Prepare new participation
         args = {
@@ -319,6 +313,11 @@ def _participation_to_db(
         if "delay" in new_p:
             args["delay_time"] = datetime.timedelta(seconds=new_p["delay"])
 
+        if p is not None:
+            for k, v in args.items():
+                setattr(p, k, v)
+            return p
+
         new_p = Participation(**args)
         session.add(new_p)
         return new_p