diff --git a/kiri-engine/Abstracts/Logger.php b/kiri-engine/Abstracts/Logger.php
index 09679746..e16e6d42 100644
--- a/kiri-engine/Abstracts/Logger.php
+++ b/kiri-engine/Abstracts/Logger.php
@@ -152,7 +152,7 @@ class Logger implements LoggerInterface
 
 		$filename = storage('log-' . date('Y-m-d') . '.log', 'log/');
 
-		file_put_contents($filename, $_string);
+		file_put_contents($filename, $_string, FILE_APPEND);
 	}