diff --git a/lam/lib/baseModule.inc b/lam/lib/baseModule.inc
index 21d67bce..c7edaa0f 100644
--- a/lam/lib/baseModule.inc
+++ b/lam/lib/baseModule.inc
@@ -1573,6 +1573,7 @@ abstract class baseModule {
 
 	/**
 	 * Adds an area with two multi-select fields with buttons to move items from right to left and vice-versa.
+	 * The options of the selects must be presorted.
 	 * <br>Names:
 	 * <ul>
 	 * <li>First select: $namePrefix_1
@@ -1601,6 +1602,7 @@ abstract class baseModule {
 		$firstSelect->setHasDescriptiveElements(true);
 		$firstSelect->setMultiSelect(true);
 		$firstSelect->setRightToLeftTextDirection($rightToLeftText);
+		$firstSelect->setSortElements(false);
 		$firstRow->add($firstSelect, 12);
 		if ($showFilter) {
 			$firstFilterGroup = new htmlGroup();
@@ -1627,6 +1629,7 @@ abstract class baseModule {
 		$secondSelect->setHasDescriptiveElements(true);
 		$secondSelect->setMultiSelect(true);
 		$secondSelect->setRightToLeftTextDirection($rightToLeftText);
+		$secondSelect->setSortElements(false);
 		$secondRow->add($secondSelect, 12);
 		if ($showFilter) {
 			$secondFilterGroup = new htmlGroup();
diff --git a/lam/lib/modules/asteriskExtension.inc b/lam/lib/modules/asteriskExtension.inc
index 0bd0f8e1..83b2d97a 100644
--- a/lam/lib/modules/asteriskExtension.inc
+++ b/lam/lib/modules/asteriskExtension.inc
@@ -440,11 +440,13 @@ class asteriskExtension extends baseModule {
                 $users_dn[getAbstractDN($dn)] = $dn;
             }
         }
+        uasort($users_dn, 'compareDN');
         if (isset($this->extensionOwners)) {
             $memberList = $this->extensionOwners;
         } else {
             $memberList = array();
         }
+        usort($memberList, 'compareDN');
         $members = array();
         for ($i = 0; $i < sizeof($memberList); $i++) {
             $members[getAbstractDN($memberList[$i])] = $memberList[$i];
diff --git a/lam/lib/modules/posixGroup.inc b/lam/lib/modules/posixGroup.inc
index d096a868..6aeec63e 100644
--- a/lam/lib/modules/posixGroup.inc
+++ b/lam/lib/modules/posixGroup.inc
@@ -307,6 +307,7 @@ class posixGroup extends baseModule implements passwordService {
 		if (isset($this->attributes['memberUid'])) {
 			$remUsers = $this->attributes['memberUid'];
 		}
+		usort($remUsers, 'compareDN');
 		$remUsersDescriptive = array();
 		foreach ($remUsers as $user) {
 			if (isset($userAndGIDs[$user])) {