diff --git a/pymbolic/parser.py b/pymbolic/parser.py
index 85f75afa5f5e548a914524c2a6a77bb271f44b93..26cabd41fb8b0d790e29b4dd17d7e8e6651aeca6 100644
--- a/pymbolic/parser.py
+++ b/pymbolic/parser.py
@@ -469,7 +469,12 @@ class Parser(object):
 
             pstate.advance()
             if pstate.is_at_end() or pstate.next_tag() is _closepar:
-                left_exp = (left_exp,)
+                if isinstance(left_exp, (tuple, list)) \
+                        and not isinstance(left_exp, FinalizedContainer):
+                    # left_expr is a container with trailing commas
+                    pass
+                else:
+                    left_exp = (left_exp,)
             else:
                 new_el = self.parse_expression(pstate, _PREC_COMMA)
                 if isinstance(left_exp, (tuple, list)) \
diff --git a/test/test_pymbolic.py b/test/test_pymbolic.py
index 2d6f3f786a3ef9c60d9299a2907785a4370a3b42..e199c763ba47de2b88b2e13c070a443c5417191f 100644
--- a/test/test_pymbolic.py
+++ b/test/test_pymbolic.py
@@ -253,8 +253,6 @@ def test_parser():
     assert_parse_roundtrip("(3,)")
 
     assert_parse_roundtrip("[x + 3, 3, 5]")
-    # FIXME: trailing commas not allowed
-    # assert parse("[x + 3, 3, 5]") == parse("[x + 3, 3, 5]")
     assert_parse_roundtrip("[]")
     assert_parse_roundtrip("[x]")
 
@@ -289,6 +287,7 @@ def test_parser():
     assert_parsed_same_as_python('5+i if i>=0 else (0 if i<-1 else 10)')
     assert_parsed_same_as_python("0 if 1 if 2 else 3 else 4")
     assert_parsed_same_as_python("0 if (1 if 2 else 3) else 4")
+    assert_parsed_same_as_python("(2, 3,)")
 
     with pytest.deprecated_call():
         parse('1+if(0, 1, 2)')