diff --git a/crates/parser/src/grammar.pest b/crates/parser/src/grammar.pest
index da34ad7..e4f748d 100644
--- a/crates/parser/src/grammar.pest
+++ b/crates/parser/src/grammar.pest
@@ -91,7 +91,7 @@ generics = { "<" ~ (generic ~ ("," ~ generic)*)? ~ ">" }
 // ======================================================
 
 tuple_type = {
-    "[" ~ (type_expr ~ ("," ~ type_expr)*)? ~ "]"
+    "[" ~ (type_expr ~ ("," ~ type_expr)*)? ~ ","? ~ "]"
 }
 
 path_type = {
@@ -455,7 +455,7 @@ closure = { type_expr? ~ "|" ~ param_list ~ "|" }
 // ------------------------------------------------------
 
 tuple = {
-    "(" ~ (expr ~ ("," ~ expr)*)? ~ ")"
+    "(" ~ (expr ~ ("," ~ expr)*)? ~ ","? ~ ")"
 }
 
 array = {