diff --git a/parser/internal/pratt_parser_test.cc b/parser/internal/pratt_parser_test.cc
index 116ae607b..6c85dd1d7 100644
--- a/parser/internal/pratt_parser_test.cc
+++ b/parser/internal/pratt_parser_test.cc
@@ -1283,6 +1283,12 @@ std::vector<ErrorTestCase> GetErrorTestCases() {
               " | f(1, 2\n"
               " | ......^",
       },
+      ErrorTestCase{
+          .source = "foo(a,b,)",
+          .expected_error = "ERROR: <input>:1:9: unexpected token\n"
+                            " | foo(a,b,)\n"
+                            " | ........^",
+      },
       ErrorTestCase{
           .source = "999999999999999999999999999999999999999",
           .expected_error = "ERROR: <input>:1:1: invalid int literal\n"
diff --git a/parser/internal/pratt_parser_worker.h b/parser/internal/pratt_parser_worker.h
index dc17f27d6..f4886aa90 100644
--- a/parser/internal/pratt_parser_worker.h
+++ b/parser/internal/pratt_parser_worker.h
@@ -852,6 +852,7 @@ std::vector<ExprNode> PrattParserWorker<ExprNode>::ParseArguments(
       if (peek_token_.type == TokenType::kComma) {
         NextToken();
         if (peek_token_.type == close_token) {
+          ReportError(peek_token_, "unexpected token");
           break;
         }
         continue;
diff --git a/parser/parser_test.cc b/parser/parser_test.cc
index d4a3294c3..e47557e6b 100644
--- a/parser/parser_test.cc
+++ b/parser/parser_test.cc
@@ -501,6 +501,17 @@ std::vector<TestInfo> test_cases = {
      "ERROR: <input>:1:3: expected struct field name\n"
      " | t{>C}\n"
      " | ..^"},
+    {"foo(a,b,)", "",
+     "ERROR: <input>:1:9: Syntax error: mismatched input ')' expecting "
+     "{'[', '{', '(', '.', '-', '!', 'true', 'false', 'null', NUM_FLOAT, "
+     "NUM_INT, NUM_UINT, STRING, BYTES, IDENTIFIER}\n"
+     " | foo(a,b,)\n"
+     " | ........^",
+     "", "", "", "",
+     // PRATT PARSER ERROR MESSAGE
+     "ERROR: <input>:1:9: unexpected token\n"
+     " | foo(a,b,)\n"
+     " | ........^"},
 
     // Macro tests
     {"has(m.f)", "m^#2:Expr.Ident#.f~test-only~^#4:Expr.Select#", "",