diff --git a/app/helpers/attachments_helper.rb b/app/helpers/attachments_helper.rb
index 50b44890..36797651 100644
--- a/app/helpers/attachments_helper.rb
+++ b/app/helpers/attachments_helper.rb
@@ -29,7 +29,13 @@ module AttachmentsHelper
   end
   
   def to_utf8(str)
-    return str if /\A[\r\n\t\x20-\x7e]*\Z/n.match(str) # for us-ascii
+    if str.respond_to?(:force_encoding)
+      str.force_encoding('UTF-8')
+      return str if str.valid_encoding?
+    else
+      return str if /\A[\r\n\t\x20-\x7e]*\Z/n.match(str) # for us-ascii
+    end
+    
     begin
       Iconv.conv('UTF-8//IGNORE', 'UTF-8', str + '  ')[0..-3]
     rescue Iconv::InvalidEncoding
diff --git a/app/helpers/repositories_helper.rb b/app/helpers/repositories_helper.rb
index 95962873..19a86e00 100644
--- a/app/helpers/repositories_helper.rb
+++ b/app/helpers/repositories_helper.rb
@@ -113,7 +113,13 @@ module RepositoriesHelper
   end
   
   def to_utf8(str)
-    return str if /\A[\r\n\t\x20-\x7e]*\Z/n.match(str) # for us-ascii
+    if str.respond_to?(:force_encoding)
+      str.force_encoding('UTF-8')
+      return str if str.valid_encoding?
+    else
+      return str if /\A[\r\n\t\x20-\x7e]*\Z/n.match(str) # for us-ascii
+    end
+    
     @encodings ||= Setting.repositories_encodings.split(',').collect(&:strip)
     @encodings.each do |encoding|
       begin
diff --git a/app/models/changeset.rb b/app/models/changeset.rb
index 80471948..ca4daace 100644
--- a/app/models/changeset.rb
+++ b/app/models/changeset.rb
@@ -227,7 +227,13 @@ class Changeset < ActiveRecord::Base
   end
 
   def self.to_utf8(str)
-    return str if /\A[\r\n\t\x20-\x7e]*\Z/n.match(str) # for us-ascii
+    if str.respond_to?(:force_encoding)
+      str.force_encoding('UTF-8')
+      return str if str.valid_encoding?
+    else
+      return str if /\A[\r\n\t\x20-\x7e]*\Z/n.match(str) # for us-ascii
+    end
+
     encoding = Setting.commit_logs_encoding.to_s.strip
     unless encoding.blank? || encoding == 'UTF-8'
       begin