diff --git a/participation/models.py b/participation/models.py
index 2dbddf8..78153d4 100644
--- a/participation/models.py
+++ b/participation/models.py
@@ -748,7 +748,7 @@ class Participation(models.Model):
                               "<p>For the first round, you will defend "
                               "<a href='{solution_url}'>your solution of the problem {problem}</a>.</p>")
             draw_url = reverse_lazy("draw:index")
-            solution_url = reverse_lazy("participation:solution_detail", args=(defender_passage.defended_solution.pk,))
+            solution_url = reverse_lazy("solution", args=(defender_passage.defended_solution.pk,))
             defender_content = format_lazy(defender_text, draw_url=draw_url,
                                            solution_url=solution_url, problem=defender_passage.solution_number)
 
@@ -780,7 +780,7 @@ class Participation(models.Model):
             defender_text = _("<p>For the second round, you will defend "
                               "<a href='{solution_url}'>your solution of the problem {problem}</a>.</p>")
             draw_url = reverse_lazy("draw:index")
-            solution_url = reverse_lazy("participation:solution_detail", args=(defender_passage.defended_solution.pk,))
+            solution_url = reverse_lazy("solution", args=(defender_passage.defended_solution.pk,))
             defender_content = format_lazy(defender_text, draw_url=draw_url,
                                            solution_url=solution_url, problem=defender_passage.solution_number)