diff --git a/src/Twig/GeneratorExtension.php b/src/Twig/GeneratorExtension.php
index 27e233d8ff359bd442981a206868ce9f3e1adac8..ccf55b583a3c6b31a33cfd5bedffc6344109b4e5 100644
--- a/src/Twig/GeneratorExtension.php
+++ b/src/Twig/GeneratorExtension.php
@@ -36,6 +36,7 @@ class GeneratorExtension extends \Twig_Extension
         return [
             new \Twig_Filter('quoteString', [TypescriptHelper::class, 'quoteString'], ['is_safe' => true]),
             new \Twig_Filter('objectKey', [TypescriptHelper::class, 'objectLiteralKey'], ['is_safe' => true]),
+            new \Twig_Filter('indent', [TypescriptHelper::class, 'indent']),
         ];
     }