diff --git a/participation/models.py b/participation/models.py
index c3bc7af..2dbddf8 100644
--- a/participation/models.py
+++ b/participation/models.py
@@ -750,19 +750,19 @@ class Participation(models.Model):
             draw_url = reverse_lazy("draw:index")
             solution_url = reverse_lazy("participation:solution_detail", args=(defender_passage.defended_solution.pk,))
             defender_content = format_lazy(defender_text, draw_url=draw_url,
-                                           solution_url=solution_url, problem=defender_passage.problem)
+                                           solution_url=solution_url, problem=defender_passage.solution_number)
 
             opponent_text = _("<p>You will oppose the solution of the team {opponent} on the problem {problem}. "
                               "You can upload your synthesis sheet on <a href='{passage_url}'>this page</a>.</p>")
             passage_url = reverse_lazy("participation:passage_detail", args=(opponent_passage.pk,))
             opponent_content = format_lazy(opponent_text, opponent=opponent_passage.defender.team.trigram,
-                                           problem=opponent_passage.problem, passage_url=passage_url)
+                                           problem=opponent_passage.solution_number, passage_url=passage_url)
 
             reporter_text = _("<p>You will report the solution of the team {reporter} on the problem {problem}. "
                               "You can upload your synthesis sheet on <a href='{passage_url}'>this page</a>.</p>")
             passage_url = reverse_lazy("participation:passage_detail", args=(reporter_passage.pk,))
             reporter_content = format_lazy(reporter_text, reporter=reporter_passage.defender.team.trigram,
-                                           problem=reporter_passage.problem, passage_url=passage_url)
+                                           problem=reporter_passage.solution_number, passage_url=passage_url)
 
             content = defender_content + opponent_content + reporter_content
             informations.append({
@@ -782,19 +782,19 @@ class Participation(models.Model):
             draw_url = reverse_lazy("draw:index")
             solution_url = reverse_lazy("participation:solution_detail", args=(defender_passage.defended_solution.pk,))
             defender_content = format_lazy(defender_text, draw_url=draw_url,
-                                           solution_url=solution_url, problem=defender_passage.problem)
+                                           solution_url=solution_url, problem=defender_passage.solution_number)
 
             opponent_text = _("<p>You will oppose the solution of the team {opponent} on the problem {problem}. "
                               "You can upload your synthesis sheet on <a href='{passage_url}'>this page</a>.</p>")
             passage_url = reverse_lazy("participation:passage_detail", args=(opponent_passage.pk,))
             opponent_content = format_lazy(opponent_text, opponent=opponent_passage.defender.team.trigram,
-                                           problem=opponent_passage.problem, passage_url=passage_url)
+                                           problem=opponent_passage.solution_number, passage_url=passage_url)
 
             reporter_text = _("<p>You will report the solution of the team {reporter} on the problem {problem}. "
                               "You can upload your synthesis sheet on <a href='{passage_url}'>this page</a>.</p>")
             passage_url = reverse_lazy("participation:passage_detail", args=(reporter_passage.pk,))
             reporter_content = format_lazy(reporter_text, reporter=reporter_passage.defender.team.trigram,
-                                           problem=reporter_passage.problem, passage_url=passage_url)
+                                           problem=reporter_passage.solution_number, passage_url=passage_url)
 
             content = defender_content + opponent_content + reporter_content
             informations.append({