diff --git a/app/models/seminar_main.rb b/app/models/seminar_main.rb
index 6f092da..62334de 100644
--- a/app/models/seminar_main.rb
+++ b/app/models/seminar_main.rb
@@ -694,4 +694,8 @@ class SeminarMain
   def enable_review_result
     self.assign_mode == 2
   end
+  def to_param
+    tmp = super()
+    URI.encode(tmp)
+  end
 end