diff --git a/apps/files_sharing/tests/etagpropagation.php b/apps/files_sharing/tests/etagpropagation.php
index 55972dd9221..67c5410dc80 100644
--- a/apps/files_sharing/tests/etagpropagation.php
+++ b/apps/files_sharing/tests/etagpropagation.php
@@ -126,7 +126,8 @@ class EtagPropagation extends PropagationTestCase {
 	public function testOwnerWritesToSingleFileShare() {
 		$this->loginAsUser(self::TEST_FILES_SHARING_API_USER1);
 		Filesystem::file_put_contents('/foo.txt', 'longer_bar');
-		Filesystem::touch('/foo.txt', time() - 1);
+		$t = (int)Filesystem::filemtime('/foo.txt') - 1;
+		Filesystem::touch('/foo.txt', $t);
 		$this->assertEtagsNotChanged([self::TEST_FILES_SHARING_API_USER4, self::TEST_FILES_SHARING_API_USER3]);
 		$this->assertEtagsChanged([self::TEST_FILES_SHARING_API_USER1, self::TEST_FILES_SHARING_API_USER2]);