diff --git a/lib/files/cache/cache.php b/lib/files/cache/cache.php
index 857fe980be640b74f446d29edc1b30f25164b766..47f3c272b13b32c0fadc6831cafa6f152cd8caf6 100644
--- a/lib/files/cache/cache.php
+++ b/lib/files/cache/cache.php
@@ -430,7 +430,7 @@ class Cache {
 		$this->calculateFolderSize($path);
 		if ($path !== '') {
 			$parent = dirname($path);
-			if ($parent === '.') {
+			if ($parent === '.' or $parent === '/') {
 				$parent = '';
 			}
 			$this->correctFolderSize($parent);
diff --git a/lib/files/cache/scanner.php b/lib/files/cache/scanner.php
index f019d4fc608b34588ffbd9d4c5b093a9b5d3f70d..5241acec1ee6b6b3c34c0196f3b98362a9020cec 100644
--- a/lib/files/cache/scanner.php
+++ b/lib/files/cache/scanner.php
@@ -68,7 +68,7 @@ class Scanner {
 			if ($data) {
 				if ($file) {
 					$parent = dirname($file);
-					if ($parent === '.') {
+					if ($parent === '.' or $parent === '/') {
 						$parent = '';
 					}
 					if (!$this->cache->inCache($parent)) {