diff --git a/crates/parser/src/grammar.pest b/crates/parser/src/grammar.pest
index a727cea..954a9ad 100644
--- a/crates/parser/src/grammar.pest
+++ b/crates/parser/src/grammar.pest
@@ -229,7 +229,8 @@ as_kw = { "as" }
 
 var_decl = {
     ("let" ~ pattern ~ ("," ~ pattern)*)
-  | type_expr ~ as_kw? ~ (!tuple_pattern ~ pattern ~ ("," ~ pattern)*)
+  | (type_expr ~ as_kw ~ (!tuple_pattern ~ pattern ~ ("," ~ pattern)+))
+  | (type_expr ~ (!tuple_pattern ~ pattern ~ ("," ~ pattern)*))
 }
 
 field = {