diff --git a/app/models/repository/subversion.rb b/app/models/repository/subversion.rb
index 68853a3cf..10cd3b6d4 100644
--- a/app/models/repository/subversion.rb
+++ b/app/models/repository/subversion.rb
@@ -20,7 +20,7 @@ require 'redmine/scm/adapters/subversion_adapter'
 class Repository::Subversion < Repository
   attr_protected :root_url
   validates_presence_of :url
-  validates_format_of :url, :with => /\A(http|https|svn(\+[^\s:\/\\]+)?|file):\/\/.+/i
+  validates_format_of :url, :with => %r{\A(http|https|svn(\+[^\s:\/\\]+)?|file):\/\/.+}i
 
   def self.scm_adapter_class
     Redmine::Scm::Adapters::SubversionAdapter