diff --git a/js/service/BoardService.js b/js/service/BoardService.js
index 34c6d0eca..0da0ef185 100644
--- a/js/service/BoardService.js
+++ b/js/service/BoardService.js
@@ -141,6 +141,7 @@ app.factory('BoardService', function (ApiService, $http, $q) {
 				board.acl = {};
 			}
 			board.acl[response.data.id] = response.data;
+			self._updateUsers();
 			deferred.resolve(response.data);
 		}, function (error) {
 			deferred.reject('Error creating ACL ' + _acl);
@@ -155,6 +156,7 @@ app.factory('BoardService', function (ApiService, $http, $q) {
 		var self = this;
 		$http.delete(this.baseUrl + '/' + acl.boardId + '/acl/' + acl.id).then(function (response) {
 			delete board.acl[response.data.id];
+			self._updateUsers();
 			deferred.resolve(response.data);
 		}, function (error) {
 			deferred.reject('Error deleting ACL ' + acl.id);
@@ -170,6 +172,7 @@ app.factory('BoardService', function (ApiService, $http, $q) {
 		var _acl = acl;
 		$http.put(this.baseUrl + '/' + acl.boardId + '/acl', _acl).then(function (response) {
 			board.acl[_acl.id] = response.data;
+			self._updateUsers();
 			deferred.resolve(response.data);
 		}, function (error) {
 			deferred.reject('Error updating ACL ' + _acl);
@@ -178,6 +181,26 @@ app.factory('BoardService', function (ApiService, $http, $q) {
 		return deferred.promise;
 	};
 
+	BoardService.prototype._updateUsers = function () {
+		if (!this.getCurrent() || !this.getCurrent().acl) {
+			return [];
+		}
+		var result = [this.getCurrent().owner];
+		angular.forEach(this.getCurrent().acl, function(value, key) {
+			if (value.type === OC.Share.SHARE_TYPE_USER) {
+				result.push(value.participant);
+			}
+		});
+		this.getCurrent()._users = result;
+	};
+
+	BoardService.prototype.getUsers = function () {
+		if (this.getCurrent() && !this.getCurrent()._users) {
+			this._updateUsers();
+		}
+		return this.getCurrent()._users;
+	};
+
 	BoardService.prototype.canRead = function () {
 		if (!this.getCurrent() || !this.getCurrent().permissions) {
 			return false;
diff --git a/templates/part.card.php b/templates/part.card.php
index cfbfcf862..c6f619739 100644
--- a/templates/part.card.php
+++ b/templates/part.card.php
@@ -61,10 +61,10 @@
 			<ui-select-match placeholder="<?php p($l->t('Assign this card to a user')); ?>">
 				<span><i class="icon icon-{{$item.type}}"></i> {{ $item.participant.displayname }}</span>
 			</ui-select-match>
-			<ui-select-choices repeat="user in boardservice.getCurrent().users | filter: $select.search | withoutAssignedUsers: cardservice.getCurrent().assignedUsers track by user.uid">
-				<div class="avatardiv" avatar ng-attr-user="{{ user.uid }}" ng-attr-displayname="{{ user.displayname }}" ng-if="boardservice.id"></div><span>{{ user.displayname }}</span>
+			<ui-select-choices repeat="acl in boardservice.getUsers() | filter: $select.search | withoutAssignedUsers: cardservice.getCurrent().assignedUsers track by acl.uid">
+				<div class="avatardiv" avatar ng-attr-user="{{ acl.uid }}" ng-attr-displayname="{{ acl.displayname }}" ng-if="boardservice.id"></div><span>{{ acl.displayname }}</span>
 			</ui-select-choices>
-	</ui-select>
+		</ui-select>
 		<div class="card-details-assign-users-list">
 			<div class="assigned-user" ng-repeat="user in cardservice.getCurrent().assignedUsers track by user.uid">
 				<avatar ng-attr-contactsmenu ng-attr-tooltip ng-attr-user="{{ user.participant.uid }}" ng-attr-displayname="{{ user.participant.displayname }}" contactsmenudelete ></avatar>