diff --git a/grammar.js b/grammar.js
index 63954fa..8229356 100644
--- a/grammar.js
+++ b/grammar.js
@@ -416,7 +416,9 @@ module.exports = grammar({
     with_template_body: $ =>
       prec.left(
         PREC.control,
-        seq($._indent, optional($.self_type), $._block, $._outdent),
+        choice(
+          seq($._indent, optional($.self_type), $._block, $._outdent),
+          seq("{", optional($._block), "}")),
       ),
 
     _extension_template_body: $ =>