diff --git a/parso/python/errors.py b/parso/python/errors.py
index 4d9bff2..2142dd1 100644
--- a/parso/python/errors.py
+++ b/parso/python/errors.py
@@ -800,18 +800,9 @@ class _ArglistRule(SyntaxRule):
 
             if argument.type == 'argument':
                 first = argument.children[0]
-                if (
-                    argument.children[1].type in _COMP_FOR_TYPES
-                    and len(node.children) >= 2
-                ):
-                    if self._normalizer.version >= (3, 7):
-                        return True
-                    elif len(node.children) == 2 and node.children[1] == ",":
-                        # trailing comma allowed until 3.7
-                        pass
-                    else:
-                        return True
-
+                if argument.children[1].type in _COMP_FOR_TYPES and len(node.children) >= 2:
+                    # a(a, b for b in c)
+                    return True
                 if first in ('*', '**'):
                     if first == '*':
                         if kw_unpacking_only:
diff --git a/test/test_python_errors.py b/test/test_python_errors.py
index 94ff0c7..743cb25 100644
--- a/test/test_python_errors.py
+++ b/test/test_python_errors.py
@@ -378,17 +378,16 @@ def test_repeated_kwarg():
 
 
 @pytest.mark.parametrize(
-    ('source', 'no_errors', 'version'), [
-        ('a(a for a in b,)', True, '3.6'),
-        ('a(a for a in b,)', False, '3.7'),
-        ('a(a for a in b, a)', False, None),
-        ('a(a, a for a in b)', False, None),
-        ('a(a, b, a for a in b, c, d)', False, None),
-        ('a(a for a in b)', True, None),
-        ('a((a for a in b), c)', True, None),
-        ('a(c, (a for a in b))', True, None),
-        ('a(a, (a for a in b), c)', True, None),
+    ('source', 'no_errors'), [
+        ('a(a for a in b,)', False),
+        ('a(a for a in b, a)', False),
+        ('a(a, a for a in b)', False),
+        ('a(a, b, a for a in b, c, d)', False),
+        ('a(a for a in b)', True),
+        ('a((a for a in b), c)', True),
+        ('a(c, (a for a in b))', True),
+        ('a(a, b, (a for a in b), c, d)', True),
     ]
 )
-def test_unparenthesized_genexp(source, no_errors, version):
-    assert bool(_get_error_list(source, version=version)) ^ no_errors
+def test_unparenthesized_genexp(source, no_errors):
+    assert bool(_get_error_list(source)) ^ no_errors