diff --git a/DependencyInjection/ChillMainExtension.php b/DependencyInjection/ChillMainExtension.php
index 166a5cb47..2ee498070 100644
--- a/DependencyInjection/ChillMainExtension.php
+++ b/DependencyInjection/ChillMainExtension.php
@@ -60,5 +60,16 @@ class ChillMainExtension extends Extension implements PrependExtensionInterface
                 'resources' => array('ChillMainBundle:Form:fields.html.twig'))
         );
         $container->prependExtensionConfig('twig', $twigConfig);
+        
+        //add DQL function to ORM (default entity_manager)
+        $container->prependExtensionConfig('doctrine', array(
+           'orm' => array(
+              'dql' => array(
+                 'string_functions' => array(
+                    'unaccent' => 'Chill\MainBundle\Doctrine\DQL\Unaccent'
+                 )
+              )
+           )
+        ));
     }
 }
diff --git a/Doctrine/DQL/Unaccent.php b/Doctrine/DQL/Unaccent.php
new file mode 100644
index 000000000..251c722a1
--- /dev/null
+++ b/Doctrine/DQL/Unaccent.php
@@ -0,0 +1,53 @@
+<?php
+
+/*
+ * Chill is a software for social workers
+ * Copyright (C) 2015 Julien Fastré <julien.fastre@champs-libres.coop>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace Chill\MainBundle\Doctrine\DQL;
+
+use Doctrine\ORM\Query\AST\Functions\FunctionNode;
+use Doctrine\ORM\Query\Lexer;
+
+/**
+ * Unaccent string using postgresql extension unaccent : 
+ * http://www.postgresql.org/docs/current/static/unaccent.html
+ * 
+ * Usage : StringFunction UNACCENT(string)
+ *
+ * @author Julien Fastré <julien.fastre@champs-libres.coop>
+ */
+class Unaccent extends FunctionNode
+{
+    private $string;
+    
+    public function getSql(\Doctrine\ORM\Query\SqlWalker $sqlWalker)
+    {
+        return 'UNACCENT(' . $this->string->dispatch($sqlWalker) .")";
+    }
+
+    public function parse(\Doctrine\ORM\Query\Parser $parser)
+    {
+        $parser->match(Lexer::T_IDENTIFIER);
+        $parser->match(Lexer::T_OPEN_PARENTHESIS);
+        
+        $this->string = $parser->StringPrimary();
+        
+        $parser->match(Lexer::T_CLOSE_PARENTHESIS);
+    }
+
+}