diff --git a/apps/files_external/lib/streamwrapper.php b/apps/files_external/lib/streamwrapper.php
index adccb2919e..b55bcf94af 100644
--- a/apps/files_external/lib/streamwrapper.php
+++ b/apps/files_external/lib/streamwrapper.php
@@ -21,7 +21,7 @@ abstract class StreamWrapper extends Common {
 	}
 
 	public function rmdir($path) {
-		if ($this->file_exists($path) and $this->isDeletable($path)) {
+		if ($this->file_exists($path) && $this->isDeletable($path)) {
 			$dh = $this->opendir($path);
 			while (($file = readdir($dh)) !== false) {
 				if ($this->is_dir($path . '/' . $file)) {
diff --git a/apps/files_external/lib/swift.php b/apps/files_external/lib/swift.php
index 11186a9f39..6a1e12986f 100644
--- a/apps/files_external/lib/swift.php
+++ b/apps/files_external/lib/swift.php
@@ -187,7 +187,7 @@ class Swift extends \OC\Files\Storage\Common {
 	public function rmdir($path) {
 		$path = $this->normalizePath($path);
 
-		if (!$this->is_dir($path) or !$this->isDeletable($path)) {
+		if (!$this->is_dir($path) || !$this->isDeletable($path)) {
 			return false;
 		}
 
diff --git a/lib/private/files/storage/common.php b/lib/private/files/storage/common.php
index 4680971b27..483a9ac666 100644
--- a/lib/private/files/storage/common.php
+++ b/lib/private/files/storage/common.php
@@ -95,11 +95,11 @@ abstract class Common implements \OC\Files\Storage\Storage {
 	}
 
 	public function isDeletable($path) {
-		if ($path === '' or $path === '/') {
+		if ($path === '' || $path === '/') {
 			return false;
 		}
 		$parent = dirname($path);
-		return $this->isUpdatable($parent);
+		return $this->isUpdatable($parent) and $this->isUpdatable($path);
 	}
 
 	public function isSharable($path) {