diff --git a/lib/private/Files/Storage/Wrapper/Encryption.php b/lib/private/Files/Storage/Wrapper/Encryption.php
index 58bd4dfddcf..fb6cdf80c6c 100644
--- a/lib/private/Files/Storage/Wrapper/Encryption.php
+++ b/lib/private/Files/Storage/Wrapper/Encryption.php
@@ -683,6 +683,8 @@ class Encryption extends Wrapper {
 				}
 			}
 		} else {
+			$source = false;
+			$target = false;
 			try {
 				$source = $sourceStorage->fopen($sourceInternalPath, 'r');
 				$target = $this->fopen($targetInternalPath, 'w');
@@ -692,10 +694,10 @@ class Encryption extends Wrapper {
 					[, $result] = Files::streamCopy($source, $target, true);
 				}
 			} finally {
-				if (isset($source) && $source !== false) {
+				if ($source !== false) {
 					fclose($source);
 				}
-				if (isset($target) && $target !== false) {
+				if ($target !== false) {
 					fclose($target);
 				}
 			}
diff --git a/tests/lib/Files/ViewTest.php b/tests/lib/Files/ViewTest.php
index ad27c3f798c..e7ad9fcc304 100644
--- a/tests/lib/Files/ViewTest.php
+++ b/tests/lib/Files/ViewTest.php
@@ -1205,6 +1205,9 @@ class ViewTest extends \Test\TestCase {
 		$storage2->method('writeStream')
 			->willThrowException(new GenericFileException('Failed to copy stream'));
 
+		$storage2->method('fopen')
+			->willReturn(false);
+
 		$storage1->mkdir('sub');
 		$storage1->file_put_contents('foo.txt', '0123456789ABCDEFGH');
 		$storage1->mkdir('dirtomove');