diff --git a/lib/private/Files/Cache/Scanner.php b/lib/private/Files/Cache/Scanner.php
index 9bd94edf5bc87..9f99bbaab2bf2 100644
--- a/lib/private/Files/Cache/Scanner.php
+++ b/lib/private/Files/Cache/Scanner.php
@@ -385,10 +385,10 @@ protected function getExistingChildren($folderId) {
 	 * @param int $reuse a combination of self::REUSE_*
 	 * @param int $folderId id for the folder to be scanned
 	 * @param bool $lock set to false to disable getting an additional read lock during scanning
-	 * @param int $oldSize the size of the folder before (re)scanning the children
+	 * @param int|float $oldSize the size of the folder before (re)scanning the children
 	 * @return int|float the size of the scanned folder or -1 if the size is unknown at this stage
 	 */
-	protected function scanChildren(string $path, $recursive, int $reuse, int $folderId, bool $lock, int $oldSize) {
+	protected function scanChildren(string $path, $recursive, int $reuse, int $folderId, bool $lock, int|float $oldSize) {
 		if ($reuse === -1) {
 			$reuse = ($recursive === self::SCAN_SHALLOW) ? self::REUSE_ETAG | self::REUSE_SIZE : self::REUSE_ETAG;
 		}
@@ -418,7 +418,10 @@ protected function scanChildren(string $path, $recursive, int $reuse, int $folde
 		return $size;
 	}
 
-	private function handleChildren($path, $recursive, $reuse, $folderId, $lock, &$size) {
+	/**
+	 * @param bool|IScanner::SCAN_RECURSIVE_INCOMPLETE $recursive
+	 */
+	private function handleChildren(string $path, $recursive, int $reuse, int $folderId, bool $lock, int|float &$size): array {
 		// we put this in it's own function so it cleans up the memory before we start recursing
 		$existingChildren = $this->getExistingChildren($folderId);
 		$newChildren = iterator_to_array($this->storage->getDirectoryContent($path));
diff --git a/lib/private/Files/ObjectStore/ObjectStoreScanner.php b/lib/private/Files/ObjectStore/ObjectStoreScanner.php
index f001f90fdaae9..d827662ae0b1a 100644
--- a/lib/private/Files/ObjectStore/ObjectStoreScanner.php
+++ b/lib/private/Files/ObjectStore/ObjectStoreScanner.php
@@ -39,7 +39,7 @@ public function scan($path, $recursive = self::SCAN_RECURSIVE, $reuse = -1, $loc
 		return [];
 	}
 
-	protected function scanChildren(string $path, $recursive, int $reuse, int $folderId, bool $lock, int $oldSize) {
+	protected function scanChildren(string $path, $recursive, int $reuse, int $folderId, bool $lock, int|float $oldSize) {
 		return 0;
 	}