diff --git a/apps/files_external/lib/config.php b/apps/files_external/lib/config.php
index a54101b442..788a136c38 100755
--- a/apps/files_external/lib/config.php
+++ b/apps/files_external/lib/config.php
@@ -427,6 +427,7 @@ class OC_Mount_Config {
 	* @param string $mountType MOUNT_TYPE_GROUP | MOUNT_TYPE_USER
 	* @param string $applicable User or group to apply mount to
 	* @param bool $isPersonal Personal or system mount point i.e. is this being called from the personal or admin page
+	* @param int|null $priority Mount point priority, null for default
 	* @return boolean
 	*/
 	public static function addMountPoint($mountPoint,
@@ -434,7 +435,8 @@ class OC_Mount_Config {
 										 $classOptions,
 										 $mountType,
 										 $applicable,
-										 $isPersonal = false) {
+										 $isPersonal = false,
+										 $priority = null) {
 		$backends = self::getBackends();
 		$mountPoint = OC\Files\Filesystem::normalizePath($mountPoint);
 		if ($mountPoint === '' || $mountPoint === '/') {
@@ -464,12 +466,19 @@ class OC_Mount_Config {
 				'options' => self::encryptPasswords($classOptions))
 			)
 		);
-		if (! $isPersonal) {
-			$mount[$applicable][$mountPoint]['priority'] = $backends[$class]['priority'];
+		if (! $isPersonal && !is_null($priority)) {
+			$mount[$applicable][$mountPoint]['priority'] = $priority;
 		}
 
 		$mountPoints = self::readData($isPersonal ? OCP\User::getUser() : NULL);
 		$mountPoints = self::mergeMountPoints($mountPoints, $mount, $mountType);
+
+		// Set default priority if none set
+		if (!isset($mountPoints[$mountType][$applicable][$mountPoint]['priority'])) {
+			$mountPoints[$mountType][$applicable][$mountPoint]['priority']
+				= $backends[$class]['priority'];
+		}
+
 		self::writeData($isPersonal ? OCP\User::getUser() : NULL, $mountPoints);
 
 		return self::getBackendStatus($class, $classOptions, $isPersonal);
@@ -757,13 +766,9 @@ class OC_Mount_Config {
 	 */
 	private static function mergeMountPoints($data, $mountPoint, $mountType) {
 		$applicable = key($mountPoint);
+		$mountPath = key($mountPoint[$applicable]);
 		if (isset($data[$mountType])) {
 			if (isset($data[$mountType][$applicable])) {
-				if (isset($mountPoints[$mountType][$applicable][$mountPoint])
-					&& isset($mountPoints[$mountType][$applicable][$mountPoint]['priority'])) {
-					$mount[$applicable][$mountPoint]['priority']
-						= $mountPoints[$mountType][$applicable][$mountPoint]['priority'];
-				}
 				$data[$mountType][$applicable]
 					= array_merge($data[$mountType][$applicable], $mountPoint[$applicable]);
 			} else {
diff --git a/apps/files_external/tests/mountconfig.php b/apps/files_external/tests/mountconfig.php
index 14fe1d90b7..33cbd10d9e 100644
--- a/apps/files_external/tests/mountconfig.php
+++ b/apps/files_external/tests/mountconfig.php
@@ -41,16 +41,22 @@ class Test_Mount_Config extends \PHPUnit_Framework_TestCase {
 	const TEST_USER1 = 'user1';
 	const TEST_USER2 = 'user2';
 	const TEST_GROUP1 = 'group1';
+	const TEST_GROUP1B = 'group1b';
 	const TEST_GROUP2 = 'group2';
+	const TEST_GROUP2B = 'group2b';
 
 	public function setUp() {
 		\OC_User::createUser(self::TEST_USER1, self::TEST_USER1);
 		\OC_User::createUser(self::TEST_USER2, self::TEST_USER2);
 
 		\OC_Group::createGroup(self::TEST_GROUP1);
+		\OC_Group::createGroup(self::TEST_GROUP1B);
 		\OC_Group::addToGroup(self::TEST_USER1, self::TEST_GROUP1);
+		\OC_Group::addToGroup(self::TEST_USER1, self::TEST_GROUP1B);
 		\OC_Group::createGroup(self::TEST_GROUP2);
+		\OC_Group::createGroup(self::TEST_GROUP2B);
 		\OC_Group::addToGroup(self::TEST_USER2, self::TEST_GROUP2);
+		\OC_Group::addToGroup(self::TEST_USER2, self::TEST_GROUP2B);
 
 		\OC_User::setUserId(self::TEST_USER1);
 		$this->userHome = \OC_User::getHome(self::TEST_USER1);
@@ -81,7 +87,9 @@ class Test_Mount_Config extends \PHPUnit_Framework_TestCase {
 		\OC_User::deleteUser(self::TEST_USER2);
 		\OC_User::deleteUser(self::TEST_USER1);
 		\OC_Group::deleteGroup(self::TEST_GROUP1);
+		\OC_Group::deleteGroup(self::TEST_GROUP1B);
 		\OC_Group::deleteGroup(self::TEST_GROUP2);
+		\OC_Group::deleteGroup(self::TEST_GROUP2B);
 
 		@unlink($this->dataDir . '/mount.json');
 
@@ -635,4 +643,113 @@ class Test_Mount_Config extends \PHPUnit_Framework_TestCase {
 		$this->assertEquals('ext', $config[1]['mountpoint']);
 		$this->assertEquals($options2, $config[1]['options']);
 	}
+
+	public function priorityDataProvider() {
+		return array(
+
+		// test 1 - group vs group
+		array(
+			array(
+				array(
+					'isPersonal' => false,
+					'mountType' => OC_Mount_Config::MOUNT_TYPE_GROUP,
+					'applicable' => self::TEST_GROUP1,
+					'priority' => 50
+				),
+				array(
+					'isPersonal' => false,
+					'mountType' => OC_Mount_Config::MOUNT_TYPE_GROUP,
+					'applicable' => self::TEST_GROUP1B,
+					'priority' => 60
+				)
+			),
+			1
+		),
+		// test 2 - user vs personal
+		array(
+			array(
+				array(
+					'isPersonal' => false,
+					'mountType' => OC_Mount_Config::MOUNT_TYPE_USER,
+					'applicable' => self::TEST_USER1,
+					'priority' => 2000
+				),
+				array(
+					'isPersonal' => true,
+					'mountType' => OC_Mount_Config::MOUNT_TYPE_USER,
+					'applicable' => self::TEST_USER1,
+					'priority' => null
+				)
+			),
+			1
+		),
+		// test 3 - all vs group vs user
+		array(
+			array(
+				array(
+					'isPersonal' => false,
+					'mountType' => OC_Mount_Config::MOUNT_TYPE_USER,
+					'applicable' => 'all',
+					'priority' => 70
+				),
+				array(
+					'isPersonal' => false,
+					'mountType' => OC_Mount_Config::MOUNT_TYPE_GROUP,
+					'applicable' => self::TEST_GROUP1,
+					'priority' => 60
+				),
+				array(
+					'isPersonal' => false,
+					'mountType' => OC_Mount_Config::MOUNT_TYPE_USER,
+					'applicable' => self::TEST_USER1,
+					'priority' => 50
+				)
+			),
+			2
+		)
+
+		);
+	}
+
+	/**
+	 * Ensure priorities are being respected
+	 * Test user is self::TEST_USER1
+	 *
+	 * @dataProvider priorityDataProvider
+	 * @param array[] $mounts array of associative array of mount parameters:
+	 *	bool $isPersonal
+	 *	string $mountType
+	 *	string $applicable
+	 *	int|null $priority null for personal
+	 * @param int $expected index of expected visible mount
+	 */
+	public function testPriority($mounts, $expected) {
+		$mountConfig = array(
+			'host' => 'somehost',
+			'user' => 'someuser',
+			'password' => 'somepassword',
+			'root' => 'someroot'
+		);
+
+		// Add mount points
+		foreach($mounts as $i => $mount) {
+			$this->assertTrue(
+				OC_Mount_Config::addMountPoint(
+					'/ext',
+					'\OC\Files\Storage\SMB',
+					$mountConfig + array('id' => $i),
+					$mount['mountType'],
+					$mount['applicable'],
+					$mount['isPersonal'],
+					$mount['priority']
+				)
+			);
+		}
+
+		// Get mount points for user
+		$mountPoints = OC_Mount_Config::getAbsoluteMountPoints(self::TEST_USER1);
+
+		$this->assertEquals(1, count($mountPoints));
+		$this->assertEquals($expected, $mountPoints['/'.self::TEST_USER1.'/files/ext']['options']['id']);
+	}
 }