diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
index 508ef55511e49d..4e73be20e1b709 100644
--- a/Modules/_testcapimodule.c
+++ b/Modules/_testcapimodule.c
@@ -1583,9 +1583,9 @@ getitem_with_error(PyObject *self, PyObject *args)
 static PyObject *
 raise_SIGINT_then_send_None(PyObject *self, PyObject *args)
 {
-    PyGenObject *gen;
+    PyObject *gen;
 
-    if (!PyArg_ParseTuple(args, "O!", &PyGen_Type, &gen))
+    if (!PyArg_ParseTuple(args, "O", &gen))
         return NULL;
 
     /* This is used in a test to check what happens if a signal arrives just
@@ -1599,7 +1599,7 @@ raise_SIGINT_then_send_None(PyObject *self, PyObject *args)
          because we check for signals before every bytecode operation.
      */
     raise(SIGINT);
-    return PyObject_CallMethod((PyObject *)gen, "send", "O", Py_None);
+    return PyObject_CallMethod(gen, "send", "O", Py_None);
 }