diff --git a/lib/private/Files/Cache/Scanner.php b/lib/private/Files/Cache/Scanner.php
index 5fd4bf968e83..d8a4f95e10db 100644
--- a/lib/private/Files/Cache/Scanner.php
+++ b/lib/private/Files/Cache/Scanner.php
@@ -191,9 +191,7 @@ public function scanFile($file, $reuseExisting = 0, $parentId = -1, $cacheData =
 						if (isset($data['storage_mtime'], $cacheData['storage_mtime']) && $data['storage_mtime'] === $cacheData['storage_mtime']) {
 							$data['mtime'] = $cacheData['mtime'];
 							if (($reuseExisting & self::REUSE_SIZE) && ($data['size'] === -1)) {
-								if (($data['mimetype'] !== 'httpd/unix-directory') || !($reuseExisting & self::REUSE_ONLY_FOR_FILES)) {
-									$data['size'] = $cacheData['size'];
-								}
+								$data['size'] = $cacheData['size'];
 							}
 							if ($reuseExisting & self::REUSE_ETAG) {
 								if (($data['mimetype'] !== 'httpd/unix-directory') || !($reuseExisting & self::REUSE_ONLY_FOR_FILES)) {
diff --git a/lib/private/Files/Cache/Watcher.php b/lib/private/Files/Cache/Watcher.php
index 4e106f0bae5b..627bb4774d29 100644
--- a/lib/private/Files/Cache/Watcher.php
+++ b/lib/private/Files/Cache/Watcher.php
@@ -100,7 +100,7 @@ public function checkUpdate($path, $cachedEntry = null) {
 	 */
 	public function update($path, $cachedData) {
 		if ($this->storage->is_dir($path)) {
-			$this->scanner->scan($path, Scanner::SCAN_SHALLOW, Scanner::REUSE_ETAG | Scanner::REUSE_ONLY_FOR_FILES);
+			$this->scanner->scan($path, Scanner::SCAN_SHALLOW, Scanner::REUSE_ETAG | Scanner::REUSE_SIZE | Scanner::REUSE_ONLY_FOR_FILES);
 		} else {
 			$this->scanner->scanFile($path);
 		}
diff --git a/lib/public/Files/Cache/IScanner.php b/lib/public/Files/Cache/IScanner.php
index 8d76fe0107ed..d7c4a889fd71 100644
--- a/lib/public/Files/Cache/IScanner.php
+++ b/lib/public/Files/Cache/IScanner.php
@@ -34,7 +34,7 @@ interface IScanner {
 	const REUSE_NONE = 0;
 	const REUSE_ETAG = 1;
 	const REUSE_SIZE = 2;
-	const REUSE_ONLY_FOR_FILES = 4;  // apply the reuse (either tag or size) only to files, not folders
+	const REUSE_ONLY_FOR_FILES = 4;  // apply the etag reuse only to files, not folders
 
 	/**
 	 * scan a single file and store it in the cache