diff --git a/apps/files_external/lib/config.php b/apps/files_external/lib/config.php
index de42fe2f755e69721e63d562f7c5d3cbd7293274..aaa6c5be1a0401f7bea55179411b48087152de3e 100755
--- a/apps/files_external/lib/config.php
+++ b/apps/files_external/lib/config.php
@@ -267,8 +267,8 @@ class OC_Mount_Config {
 										 $applicable,
 										 $isPersonal = false) {
 		$mountPoint = OC\Files\Filesystem::normalizePath($mountPoint);
-		if ($mountPoint === '' || $mountPoint === '/') {
-			// can't mount at root
+		if ($mountPoint === '' || $mountPoint === '/' || $mountPoint == '/Shared') {
+			// can't mount at root or "Shared" folder
 			return false;
 		}
 		if ($isPersonal) {
diff --git a/apps/files_external/tests/mountconfig.php b/apps/files_external/tests/mountconfig.php
index 77241c4dd2a597bb2358e4d284a5d3187620df9f..941aec680bbb1be0794a1ec7579498d8d8a248df 100644
--- a/apps/files_external/tests/mountconfig.php
+++ b/apps/files_external/tests/mountconfig.php
@@ -44,6 +44,8 @@ class Test_Mount_Config extends \PHPUnit_Framework_TestCase {
 		$isPersonal = false;
 		$this->assertEquals(false, OC_Mount_Config::addMountPoint('', $storageClass, array(), $mountType, $applicable, $isPersonal));
 		$this->assertEquals(false, OC_Mount_Config::addMountPoint('/', $storageClass, array(), $mountType, $applicable, $isPersonal));
+		$this->assertEquals(false, OC_Mount_Config::addMountPoint('Shared', $storageClass, array(), $mountType, $applicable, $isPersonal));
+		$this->assertEquals(false, OC_Mount_Config::addMountPoint('/Shared', $storageClass, array(), $mountType, $applicable, $isPersonal));
 
 	}
 }