diff --git a/grammar.js b/grammar.js
index 4457076..35f512c 100644
--- a/grammar.js
+++ b/grammar.js
@@ -12,7 +12,7 @@ module.exports = grammar(
       $.package,
       $.config
     )),
-    _name_fragment: $ => /[A-Za-z0-9]+/,
+    _name_fragment: $ => /[A-Za-z0-9_]+/,
     name: $ => choice(
       $._name_fragment,
       seq('"', $._name_fragment, '"'),