diff --git a/htdocs/core/class/extrafields.class.php b/htdocs/core/class/extrafields.class.php
index 17226e7d461..6c6a9de1e99 100755
--- a/htdocs/core/class/extrafields.class.php
+++ b/htdocs/core/class/extrafields.class.php
@@ -825,7 +825,7 @@ class ExtraFields
 			
 			$sql = 'SELECT '.$InfoFieldList[1];
 			$sql.= ' FROM '.MAIN_DB_PREFIX .$InfoFieldList[0];
-			$sql.= ' WHERE '.$keyList.'="'.$this->db->escape($value).'"';
+			$sql.= ' WHERE '.$keyList.'=\''.$this->db->escape($value).'\'';
 			//$sql.= ' AND entity = '.$conf->entity;
 			dol_syslog(get_class($this).':showOutputField:$type=sellist sql='.$sql);
 			$resql = $this->db->query($sql);