diff --git a/htdocs/hrm/position.php b/htdocs/hrm/position.php
index 14ed85466c0..8eec7d0e660 100644
--- a/htdocs/hrm/position.php
+++ b/htdocs/hrm/position.php
@@ -524,7 +524,7 @@ function DisplayPositionList()
 	/* If a group by is required
 	$sql .= " GROUP BY ";
 	foreach($object->fields as $key => $val) {
-		$sql .= 't.'.$key.', ';
+		$sql .= "t.".$key.", ";
 	}
 	// Add fields from extrafields
 	if (!empty($extrafields->attributes[$object->table_element]['label'])) {