diff --git a/tests/lib/encryption/keys/storage.php b/tests/lib/encryption/keys/storage.php
index 4fec24094fdd45fe6e7030ed7c254fdc652aeb18..8af3821dc9332cc40400d6a7bc8de0ee2d423c28 100644
--- a/tests/lib/encryption/keys/storage.php
+++ b/tests/lib/encryption/keys/storage.php
@@ -393,7 +393,7 @@ class StorageTest extends TestCase {
 			->willReturn($systemWideMountPoint);
 
 		$this->assertSame($expected,
-			\Test_Helper::invokePrivate($this->storage, 'getPathToKeys', [$path])
+			self::invokePrivate($this->storage, 'getPathToKeys', [$path])
 		);
 	}