diff --git a/administrator/components/com_users/views/users/tmpl/modal.php b/administrator/components/com_users/views/users/tmpl/modal.php
index 9baf6fe79c014..ec412b4e276ea 100644
--- a/administrator/components/com_users/views/users/tmpl/modal.php
+++ b/administrator/components/com_users/views/users/tmpl/modal.php
@@ -27,13 +27,29 @@
 $enabledStates   = array(0 => 'icon-publish', 1 => 'icon-unpublish');
 $activatedStates = array(0 => 'icon-publish', 1 => 'icon-unpublish');
 $userRequired    = (int) $input->get('required', 0, 'int');
+
+/**
+ * Mootools compatibility
+ *
+ * There is an extra option passed in the url for the iframe &ismoo=0 for the bootstraped field.
+ * By default the value will be 1 or defaults to mootools behaviour using function jSelectUser()
+ *
+ * This should be removed when mootools won't be shipped by Joomla.
+ */
+$isMoo      = $input->getInt('ismoo', 1);
+
+if ($isMoo)
+{
+	$onClick = "window.parent.jSelectUser(this);window.parent.jQuery('.modal.in').modal('hide');";
+}
+
 ?>
 <div class="container-popup">
 	<form action="<?php echo JRoute::_('index.php?option=com_users&view=users&layout=modal&tmpl=component&groups=' . $input->get('groups', '', 'BASE64') . '&excluded=' . $input->get('excluded', '', 'BASE64')); ?>" method="post" name="adminForm" id="adminForm">
 		<?php if (!$userRequired) : ?>
 		<div class="pull-left">
 			<button type="button" class="btn button-select" data-user-value="0" data-user-name="<?php echo $this->escape(JText::_('JLIB_FORM_SELECT_USER')); ?>"
-				data-user-field="<?php echo $this->escape($field);?>"><?php echo JText::_('JOPTION_NO_USER'); ?></button>&nbsp;
+				data-user-field="<?php echo $this->escape($field);?>" <?php if ($isMoo) : ?>value="" onclick="window.parent.jSelectUser(this)"<?php endif; ?>><?php echo JText::_('JOPTION_NO_USER'); ?></button>&nbsp;
 		</div>
 		<?php endif; ?>
 		<?php echo JLayoutHelper::render('joomla.searchtools.default', array('view' => $this)); ?>
@@ -79,7 +95,7 @@
 				<tr class="row<?php echo $i % 2; ?>">
 					<td>
 						<a class="pointer button-select" href="#" data-user-value="<?php echo $item->id; ?>" data-user-name="<?php echo $this->escape($item->name); ?>"
-							data-user-field="<?php echo $this->escape($field);?>" onclick="if (window.parent) window.parent.jSelectUser(this);">
+							data-user-field="<?php echo $this->escape($field);?>" <?php if ($isMoo) : ?>onclick="<?php echo $onClick; ?>"<?php endif; ?>>
 							<?php echo $this->escape($item->name); ?>
 						</a>
 					</td>
diff --git a/administrator/templates/isis/html/layouts/joomla/form/field/user.php b/administrator/templates/isis/html/layouts/joomla/form/field/user.php
index 272db3868b6d2..1ffe7948a7170 100644
--- a/administrator/templates/isis/html/layouts/joomla/form/field/user.php
+++ b/administrator/templates/isis/html/layouts/joomla/form/field/user.php
@@ -48,7 +48,7 @@
 
 // Set the link for the user selection page
 $link = 'index.php?option=com_users&amp;view=users&amp;layout=modal&amp;tmpl=component&amp;required='
-	. ($required ? 1 : 0) . '&amp;field={field-user-id}'
+	. ($required ? 1 : 0) . '&amp;field={field-user-id}&amp;ismoo=0'
 	. (isset($groups) ? ('&amp;groups=' . base64_encode(json_encode($groups))) : '')
 	. (isset($excluded) ? ('&amp;excluded=' . base64_encode(json_encode($excluded))) : '');
 
diff --git a/templates/protostar/html/layouts/joomla/form/field/user.php b/templates/protostar/html/layouts/joomla/form/field/user.php
index e299a4ec624c2..87142b9d32a3f 100644
--- a/templates/protostar/html/layouts/joomla/form/field/user.php
+++ b/templates/protostar/html/layouts/joomla/form/field/user.php
@@ -48,7 +48,7 @@
 
 // Set the link for the user selection page
 $link = 'index.php?option=com_users&amp;view=users&amp;layout=modal&amp;tmpl=component&amp;required='
-	. ($required ? 1 : 0) . '&amp;field={field-user-id}'
+	. ($required ? 1 : 0) . '&amp;field={field-user-id}&amp;ismoo=0'
 	. (isset($groups) ? ('&amp;groups=' . base64_encode(json_encode($groups))) : '')
 	. (isset($excluded) ? ('&amp;excluded=' . base64_encode(json_encode($excluded))) : '');