--- a/mercurial/cext/revlog.c	Fri Jan 15 12:52:52 2021 -0500
+++ b/mercurial/cext/revlog.c	Fri Jan 15 12:56:25 2021 -0500
@@ -498,7 +498,7 @@
 			return -1;
 		}
 
-		result = PyEval_CallObject(filter, arglist);
+		result = PyObject_Call(filter, arglist, NULL);
 		Py_DECREF(arglist);
 		if (!result) {
 			return -1;