diff --git a/mypyc/lib-rt/CPy.h b/mypyc/lib-rt/CPy.h
index 83607281e974..8379486355c8 100644
--- a/mypyc/lib-rt/CPy.h
+++ b/mypyc/lib-rt/CPy.h
@@ -147,6 +147,11 @@ static PyObject *CPyType_FromTemplate(PyTypeObject *template_,
if (!ns)
goto error;
+ if (bases != orig_bases) {
+ if (PyDict_SetItemString(ns, "__orig_bases__", orig_bases) < 0)
+ goto error;
+ }
+
dummy_class = (PyTypeObject *)PyObject_CallFunctionObjArgs(
(PyObject *)metaclass, name, bases, ns, NULL);
Py_DECREF(ns);
diff --git a/mypyc/test-data/run-classes.test b/mypyc/test-data/run-classes.test
index a909f64def12..4d012ec425ac 100644
--- a/mypyc/test-data/run-classes.test
+++ b/mypyc/test-data/run-classes.test
@@ -438,7 +438,7 @@ assert a.foo() == 11
assert foo() == 21
[case testGenericClass]
-from typing import TypeVar, Generic
+from typing import TypeVar, Generic, Sequence
T = TypeVar('T')
class C(Generic[T]):
x: T
@@ -449,6 +449,12 @@ class C(Generic[T]):
def set(self, y: T) -> None:
self.x = y
+# Test subclassing generic classes both with and without a generic param
+class A(Sequence[int]):
+ pass
+class B(Sequence[T]):
+ pass
+
def f(c: C[int]) -> int:
y = c.get()
d = C[int](2)
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