diff --git a/apps/files_external/lib/Lib/Storage/AmazonS3.php b/apps/files_external/lib/Lib/Storage/AmazonS3.php
index fdcbf33627e17..4fdc9beba8256 100644
--- a/apps/files_external/lib/Lib/Storage/AmazonS3.php
+++ b/apps/files_external/lib/Lib/Storage/AmazonS3.php
@@ -414,17 +414,17 @@ public function fopen(string $path, string $mode) {
 				}
 			case 'w':
 			case 'wb':
+			case 'w+':
+			case 'wb+':
 				$tmpFile = Server::get(ITempManager::class)->getTemporaryFile();
 
-				$handle = fopen($tmpFile, 'w');
+				$handle = fopen($tmpFile, $mode);
 				return CallbackWrapper::wrap($handle, null, null, function () use ($path, $tmpFile): void {
 					$this->writeBack($tmpFile, $path);
 				});
 			case 'a':
 			case 'ab':
 			case 'r+':
-			case 'w+':
-			case 'wb+':
 			case 'a+':
 			case 'x':
 			case 'x+':