diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index c727d0b..288f734 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -1109,6 +1109,11 @@ module ApplicationHelper
     url = params[:back_url]
     if url.nil? && referer = request.env['HTTP_REFERER']
       url = CGI.unescape(referer.to_s)
+      # URLs that contains the utf8=[checkmark] parameter added by Rails are
+      # parsed as invalid by URI.parse so the redirect to the back URL would
+      # not be accepted (ApplicationController#validate_back_url would return
+      # false)
+      url.gsub!(/(\?|&)utf8=\u2713&?/, '\1')
     end
     url
   end
diff --git a/test/unit/helpers/application_helper_test.rb b/test/unit/helpers/application_helper_test.rb
index 89af800..48260cc 100644
--- a/test/unit/helpers/application_helper_test.rb
+++ b/test/unit/helpers/application_helper_test.rb
@@ -1538,4 +1538,9 @@ RAW
     assert_equal "#{ja} #{ja}...", result
     assert !result.html_safe?
   end
+
+  def test_back_url_should_remove_utf8_checkmark_from_referer
+    stubs(:request).returns(stub(:env => {'HTTP_REFERER' => "/path?utf8=\u2713&foo=bar"}))
+    assert_equal "/path?foo=bar", back_url
+  end
 end