diff --git a/app/helpers/activity_helper.rb b/app/helpers/activity_helper.rb
index f65882547..965e828a2 100644
--- a/app/helpers/activity_helper.rb
+++ b/app/helpers/activity_helper.rb
@@ -9,7 +9,7 @@ module ActivityHelper
       else
         title = truncate(activity_title, length: len)
       end
-      message = message.gsub(/#{activity_title}/, title )
+      message = message.gsub(/#{Regexp.escape(activity_title)}/, title )
     end
     sanitize_input(message) if message
   end