diff --git a/lib/private/files/cache/wrapper/cachewrapper.php b/lib/private/files/cache/wrapper/cachewrapper.php
index 040358ec65..d3d64e3f0a 100644
--- a/lib/private/files/cache/wrapper/cachewrapper.php
+++ b/lib/private/files/cache/wrapper/cachewrapper.php
@@ -233,6 +233,15 @@ class CacheWrapper extends Cache {
 		return $this->cache->getPathById($id);
 	}
 
+	/**
+	 * Returns the numeric storage id
+	 *
+	 * @return int
+	 */
+	public function getNumericStorageId() {
+		return $this->cache->getNumericStorageId();
+	}
+
 	/**
 	 * get the storage id of the storage for a file and the internal path of the file
 	 * unlike getPathById this does not limit the search to files on this storage and
diff --git a/tests/lib/files/cache/cache.php b/tests/lib/files/cache/cache.php
index 7360e9885c..7e44cb898a 100644
--- a/tests/lib/files/cache/cache.php
+++ b/tests/lib/files/cache/cache.php
@@ -35,6 +35,10 @@ class Cache extends \Test\TestCase {
 	 */
 	protected $cache2;
 
+	public function testGetNumericId() {
+		$this->assertNotNull($this->cache->getNumericStorageId());
+	}
+
 	public function testSimple() {
 		$file1 = 'foo';
 		$file2 = 'foo/bar';