diff --git a/lib/private/files/mount/mountpoint.php b/lib/private/files/mount/mountpoint.php
index b606c625cb..58d8288c7b 100644
--- a/lib/private/files/mount/mountpoint.php
+++ b/lib/private/files/mount/mountpoint.php
@@ -188,6 +188,7 @@ class MountPoint implements IMountPoint {
 	 * @return string
 	 */
 	public function getInternalPath($path) {
+		$path = Filesystem::normalizePath($path);
 		if ($this->mountPoint === $path or $this->mountPoint . '/' === $path) {
 			$internalPath = '';
 		} else {