diff --git a/src/PadsJson.php b/src/PadsJson.php
index 3818cb7..0238ec5 100644
--- a/src/PadsJson.php
+++ b/src/PadsJson.php
@@ -44,7 +44,7 @@ protected function padLiteral($tmpJson)
             return $tmpJson;
         }
 
-        $match = \preg_match('/(tr?u?e?|fa?l?s?e|nu?l?l?)$/', $tmpJson, $matches);
+        $match = \preg_match('/(tr?u?e?|fa?l?s?e?|nu?l?l?)$/', $tmpJson, $matches);
 
         if (!$match || null === $literal = $this->maybeLiteral($matches[1])) {
             return $tmpJson;