diff --git a/tree_sitter_v/grammar.js b/tree_sitter_v/grammar.js
index fb5ae721..81ad3572 100644
--- a/tree_sitter_v/grammar.js
+++ b/tree_sitter_v/grammar.js
@@ -1190,11 +1190,12 @@ module.exports = grammar({
 		for_statement: ($) =>
 			seq(
 				'for',
-				optional(choice($.range_clause, $.for_clause, $.mut_is_clause, $._expression)),
+				optional(choice($.range_clause, $.for_clause, $.is_clause, $._expression)),
 				field('body', $.block),
 			),
 
-		mut_is_clause: ($) => prec.left(PREC.primary, seq('mut', $.is_expression)),
+		is_clause: ($) =>
+			prec(PREC.primary, seq(optional(alias('mut', $.mutability_modifiers)), $.is_expression)),
 
 		range_clause: ($) =>
 			prec.left(