diff --git a/lib/private/Files/ObjectStore/ObjectStoreStorage.php b/lib/private/Files/ObjectStore/ObjectStoreStorage.php
index adb3928b28ab4..898f64d97c256 100644
--- a/lib/private/Files/ObjectStore/ObjectStoreStorage.php
+++ b/lib/private/Files/ObjectStore/ObjectStoreStorage.php
@@ -335,6 +335,7 @@ public function fopen($path, $mode) {
 				$handle = fopen($tmpFile, $mode);
 				return CallbackWrapper::wrap($handle, null, null, function () use ($path, $tmpFile) {
 					$this->writeBack($tmpFile, $path);
+					unlink($tmpFile);
 				});
 			case 'a':
 			case 'ab':
@@ -352,6 +353,7 @@ public function fopen($path, $mode) {
 				$handle = fopen($tmpFile, $mode);
 				return CallbackWrapper::wrap($handle, null, null, function () use ($path, $tmpFile) {
 					$this->writeBack($tmpFile, $path);
+					unlink($tmpFile);
 				});
 		}
 		return false;