diff --git a/src/spoolsize.php b/src/spoolsize.php
index d32143c1..4ae6c285 100644
--- a/src/spoolsize.php
+++ b/src/spoolsize.php
@@ -22,7 +22,7 @@ if ($db->query("SELECT uid,login FROM membres;")) {
     } else {
       // The QUOTA system being disabled, we need to use 'du' on each folder.
       $login = $db->f('login');
-      $size=exec("/usr/bin/du /var/www/alternc/".substr($login,0,1)."/".$login);
+      $size=exec("/usr/bin/du -s /var/www/alternc/".substr($login,0,1)."/".$login);
     }
     $db2->query("REPLACE INTO size_web SET uid=?, size=?;",array(intval($db->f('uid')),intval($size)));
     echo $db->f('login')." (".(round($size/1024, 1))." MB)\n";
@@ -58,9 +58,9 @@ if ($db->query("SELECT uid, name FROM mailman;")) {
     }
     foreach ($cc as $c){
       echo $c["uid"]."/".$c["name"]; flush();
-      $size1=exec("sudo /usr/bin/du ".escapeshellarg("/var/lib/mailman/lists/".$c["name"]));
-      $size2=exec("sudo /usr/bin/du ".escapeshellarg("/var/lib/mailman/archives/private/".$c["name"]));
-      $size3=exec("sudo /usr/bin/du ".escapeshellarg("/var/lib/mailman/archives/private/".$c["name"].".mbox"));
+      $size1=exec("sudo /usr/bin/du -s ".escapeshellarg("/var/lib/mailman/lists/".$c["name"]));
+      $size2=exec("sudo /usr/bin/du -s ".escapeshellarg("/var/lib/mailman/archives/private/".$c["name"]));
+      $size3=exec("sudo /usr/bin/du -s ".escapeshellarg("/var/lib/mailman/archives/private/".$c["name"].".mbox"));
       $size=(intval($size1)+intval($size2)+intval($size3));
       $db->query("REPLACE INTO size_mailman SET uid=?,list=?,size=?;",array($c["uid"],$c["name"],$size));
       echo " done (".(round($size/1024, 1))." MB) \n"; flush();