diff --git a/tests/lib/Files/Storage/Wrapper/EncryptionTest.php b/tests/lib/Files/Storage/Wrapper/EncryptionTest.php
index d152a51ed858a..e534edbb0e0b5 100644
--- a/tests/lib/Files/Storage/Wrapper/EncryptionTest.php
+++ b/tests/lib/Files/Storage/Wrapper/EncryptionTest.php
@@ -613,7 +613,7 @@ public function testGetHeader($path, $strippedPathExists, $strippedPath) {
 		$util->expects($this->once())->method('stripPartialFileExtension')
 			->with($path)->willReturn($strippedPath);
 		$sourceStorage->expects($this->once())
-			->method('file_exists')
+			->method('is_file')
 			->with($strippedPath)
 			->willReturn($strippedPathExists);