diff --git a/lib/cretonne/meta/constant_hash.py b/lib/cretonne/meta/constant_hash.py
index 96560ffc87..47f5eebe33 100644
--- a/lib/cretonne/meta/constant_hash.py
+++ b/lib/cretonne/meta/constant_hash.py
@@ -9,7 +9,7 @@ from __future__ import absolute_import
 from cdsl import next_power_of_two
 
 try:
-    from typing import Any, List, Sequence, Callable  # noqa
+    from typing import Any, List, Iterable, Callable  # noqa
 except ImportError:
     pass
 
@@ -32,7 +32,7 @@ def simple_hash(s):
 
 
 def compute_quadratic(items, hash_function):
-    # type: (Sequence[Any], Callable[[Any], int]) -> List[Any]
+    # type: (Iterable[Any], Callable[[Any], int]) -> List[Any]
     """
     Compute an open addressed, quadratically probed hash table containing
     `items`. The returned table is a list containing the elements of the
diff --git a/lib/cretonne/meta/mypy.ini b/lib/cretonne/meta/mypy.ini
index ca7f5e4c00..7046100b4c 100644
--- a/lib/cretonne/meta/mypy.ini
+++ b/lib/cretonne/meta/mypy.ini
@@ -1,5 +1,4 @@
 [mypy]
-python_version = 2.7
 disallow_untyped_defs = True
 warn_unused_ignores = True
 warn_return_any = True