diff --git a/htdocs/core/ajax/box.php b/htdocs/core/ajax/box.php
index 5497aec426e..c8b852d4e87 100644
--- a/htdocs/core/ajax/box.php
+++ b/htdocs/core/ajax/box.php
@@ -54,7 +54,12 @@ print '<!-- Ajax page called with url '.$_SERVER["PHP_SELF"].'?'.$_SERVER["QUERY
 // Add a box
 if ($boxid > 0 && $zone !='' && $userid > 0)
 {
-    $boxorder=preg_replace('/^A:/','A:'.$boxid.',',$boxorder);    // Insert id of new box into list
+	$tmp=explode('-',$boxorder);
+	$nbboxonleft=substr_count($tmp[0],',');
+	$nbboxonright=substr_count($tmp[1],',');
+	print $nbboxonleft.'-'.$nbboxonright;
+	if ($nbboxonleft > $nbboxonright) $boxorder=preg_replace('/B:/','B:'.$boxid.',',$boxorder);    // Insert id of new box into list
+    else $boxorder=preg_replace('/^A:/','A:'.$boxid.',',$boxorder);    // Insert id of new box into list
 }
 
 // Registering the location of boxes after a move