diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 83bbdda4a41..018aef19519 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -4394,12 +4394,12 @@ abstract class CommonObject
 					}
 					if ( !empty($conf->global->MAIN_EXTRAFIELDS_USE_TWO_COLUMS) && ($e % 2) == 0)
 					{
-						$out .= '<tr '.$class.$csstyle.'>';
+						$out .= '<tr '.$class.$csstyle.' class="'.$this->element.'_extras_'.$key.'">';
 						$colspan='0';
 					}
 					else
 					{
-						$out .= '<tr '.$class.$csstyle.'>';
+						$out .= '<tr '.$class.$csstyle.' class="'.$this->element.'_extras_'.$key.'">';
 					}
 					// Convert date into timestamp format
 					if (in_array($extrafields->attribute_type[$key],array('date','datetime')))