diff --git a/src/JsonEncoder.php b/src/JsonEncoder.php
index fc7b30a..9b9d5fa 100644
--- a/src/JsonEncoder.php
+++ b/src/JsonEncoder.php
@@ -285,7 +285,7 @@ public function encodeFile($data, $path, $schema = null)
             $errorCode = $errno;
         });
 
-        file_put_contents($path, $content);
+        file_put_contents($path, $content, LOCK_EX);
 
         restore_error_handler();