diff --git a/op/op.UsrMgr.php b/op/op.UsrMgr.php
index 63ed65b01..70029a17b 100644
--- a/op/op.UsrMgr.php
+++ b/op/op.UsrMgr.php
@@ -94,10 +94,13 @@ if ($action == "adduser") {
 	}
 	else UI::exitError(getMLText("admin_tools"),getMLText("access_denied"));
 	
-	if(isset($_POST["workflow"])) {
-		$workflow = $dms->getWorkflow($_POST["workflow"]);
-		if($workflow)
-			$newUser->setMandatoryWorkflow($workflow);
+	if(isset($_POST["workflows"]) && $_POST["workflows"]) {
+		$workflows = array();
+		foreach($_POST["workflows"] as $workflowid)
+			if($tmp = $dms->getWorkflow($workflowid))
+				$workflows[] = $tmp;
+		if($workflows)
+			$newUser->setMandatoryWorkflows($workflows);
 	}
 
 	if (isset($_POST["usrReviewers"])){
@@ -245,13 +248,14 @@ else if ($action == "edituser") {
 		if(!$isDisabled)
 			$editedUser->clearLoginFailures();
 	}
-	if(isset($_POST["workflow"]) && $_POST["workflow"]) {
-		$currworkflow = $editedUser->getMandatoryWorkflow();
-		if (!$currworkflow || ($currworkflow->getID() != $_POST["workflow"])) {
-			$workflow = $dms->getWorkflow($_POST["workflow"]);
-			if($workflow)
-				$editedUser->setMandatoryWorkflow($workflow);
+	if(isset($_POST["workflows"]) && $_POST["workflows"]) {
+		$workflows = array();
+		foreach($_POST["workflows"] as $workflowid) {
+			if($tmp = $dms->getWorkflow($workflowid))
+				$workflows[] = $tmp;
 		}
+		if($workflows)
+			$editedUser->setMandatoryWorkflows($workflows);
 	} else {
 		$editedUser->delMandatoryWorkflow();
 	}
diff --git a/views/bootstrap/class.UsrMgr.php b/views/bootstrap/class.UsrMgr.php
index 849e77e9b..1c52b6e8c 100644
--- a/views/bootstrap/class.UsrMgr.php
+++ b/views/bootstrap/class.UsrMgr.php
@@ -374,12 +374,15 @@ $(document).ready( function() {
 				<div class="cbSelectTitle"><?php printMLText("workflow");?>:</div>
 			</td>
 			<td>
-        <select name="workflow" data-placeholder="<?php printMLText('select_workflow'); ?>">
+        <select class="chzn-select" name="workflows[]" multiple="multiple" data-placeholder="<?php printMLText('select_workflow'); ?>">
 <?php
 				print "<option value=\"\">"."</option>";
+				$mandatoryworkflows = $currUser ? $currUser->getMandatoryWorkflows() : array();
 				foreach ($workflows as $workflow) {
 					print "<option value=\"".$workflow->getID()."\"";
-					if($currUser && $currUser->getMandatoryWorkflow() && $currUser->getMandatoryWorkflow()->getID() == $workflow->getID())
+					$checked = false;
+					foreach($mandatoryworkflows as $mw) if($mw->getID() == $workflow->getID()) $checked = true;
+					if($checked)
 						echo " selected=\"selected\"";
 					print ">". htmlspecialchars($workflow->getName())."</option>";
 				}