diff --git a/app/controllers/repositories_controller.rb b/app/controllers/repositories_controller.rb
index de44f1d08..ecf900849 100644
--- a/app/controllers/repositories_controller.rb
+++ b/app/controllers/repositories_controller.rb
@@ -218,7 +218,7 @@ class RepositoriesController < ApplicationController
     @rev = params[:rev].blank? ? @repository.default_branch : params[:rev].strip
     @rev_to = params[:rev_to]
     
-    unless @rev.to_s.match(REV_PARAM_RE) && @rev.to_s.match(REV_PARAM_RE)
+    unless @rev.to_s.match(REV_PARAM_RE) && @rev_to.to_s.match(REV_PARAM_RE)
       if @repository.branches.blank?
         raise InvalidRevisionParam
       end
diff --git a/test/functional/repositories_subversion_controller_test.rb b/test/functional/repositories_subversion_controller_test.rb
index be2b6087d..54cc4cd67 100644
--- a/test/functional/repositories_subversion_controller_test.rb
+++ b/test/functional/repositories_subversion_controller_test.rb
@@ -172,6 +172,12 @@ class RepositoriesSubversionControllerTest < ActionController::TestCase
       assert_error_tag :content => /was not found/
     end
 
+    def test_invalid_revision_diff
+      get :diff, :id => 1, :rev => '1', :rev_to => 'something_weird'
+      assert_response 404
+      assert_error_tag :content => /was not found/
+    end
+
     def test_empty_revision
       ['', ' ', nil].each do |r|
         get :revision, :id => 1, :rev => r