diff --git a/htdocs/core/class/extrafields.class.php b/htdocs/core/class/extrafields.class.php
index 8ac336f84f8..fbd857b0e27 100644
--- a/htdocs/core/class/extrafields.class.php
+++ b/htdocs/core/class/extrafields.class.php
@@ -1233,7 +1233,7 @@ class ExtraFields
 							$InfoFieldList[4] = str_replace('$ID$', '0', $InfoFieldList[4]);
 						}
 						//We have to join on extrafield table
-						if (strpos($InfoFieldList[4], 'extra') !== false) {
+						if (strpos($InfoFieldList[4], 'extra.') !== false) {
 							$sql .= ' as main, '.$this->db->prefix().$InfoFieldList[0].'_extrafields as extra';
 							$sqlwhere .= " WHERE extra.fk_object=main.".$InfoFieldList[2]." AND ".$InfoFieldList[4];
 						} else {