diff --git a/Objects/call.c b/Objects/call.c
index ba2ddcb..be8e90d 100644
--- a/Objects/call.c
+++ b/Objects/call.c
@@ -514,7 +514,7 @@
         }
 
         if (flags & METH_KEYWORDS) {
-            result = (*(PyCFunctionWithKeywords)meth) (self, argstuple, kwargs);
+            result = (*(PyCFunctionWithKeywords)(void(*)(void))meth) (self, argstuple, kwargs);
         }
         else {
             result = (*meth) (self, argstuple);
@@ -529,7 +529,7 @@
             goto no_keyword_error;
         }
 
-        result = (*(_PyCFunctionFast)meth) (self, args, nargs);
+        result = (*(_PyCFunctionFast)(void(*)(void))meth) (self, args, nargs);
         break;
     }
 
@@ -537,7 +537,7 @@
     {
         PyObject *const *stack;
         PyObject *kwnames;
-        _PyCFunctionFastWithKeywords fastmeth = (_PyCFunctionFastWithKeywords)meth;
+        _PyCFunctionFastWithKeywords fastmeth = (_PyCFunctionFastWithKeywords)(void(*)(void))meth;
 
         if (_PyStack_UnpackDict(args, nargs, kwargs, &stack, &kwnames) < 0) {
             goto exit;
@@ -650,12 +650,12 @@
         if (nkwargs) {
             goto no_keyword_error;
         }
-        result = ((_PyCFunctionFast)meth) (self, args, nargs);
+        result = ((_PyCFunctionFast)(void(*)(void))meth) (self, args, nargs);
         break;
 
     case METH_FASTCALL | METH_KEYWORDS:
         /* Fast-path: avoid temporary dict to pass keyword arguments */
-        result = ((_PyCFunctionFastWithKeywords)meth) (self, args, nargs, kwnames);
+        result = ((_PyCFunctionFastWithKeywords)(void(*)(void))meth) (self, args, nargs, kwnames);
         break;
 
     case METH_VARARGS:
@@ -689,7 +689,7 @@
                 kwdict = NULL;
             }
 
-            result = (*(PyCFunctionWithKeywords)meth) (self, argtuple, kwdict);
+            result = (*(PyCFunctionWithKeywords)(void(*)(void))meth) (self, argtuple, kwdict);
             Py_XDECREF(kwdict);
         }
         else {
@@ -752,7 +752,7 @@
             return NULL;
         }
 
-        result = (*(PyCFunctionWithKeywords)meth)(self, args, kwargs);
+        result = (*(PyCFunctionWithKeywords)(void(*)(void))meth)(self, args, kwargs);
 
         Py_LeaveRecursiveCall();
     }
diff --git a/Objects/dictobject.c b/Objects/dictobject.c
index 2f108bd..72cb4c5 100644
--- a/Objects/dictobject.c
+++ b/Objects/dictobject.c
@@ -3095,15 +3095,15 @@
 
 static PyMethodDef mapp_methods[] = {
     DICT___CONTAINS___METHODDEF
-    {"__getitem__", (PyCFunction)dict_subscript,        METH_O | METH_COEXIST,
+    {"__getitem__", (PyCFunction)(void(*)(void))dict_subscript,        METH_O | METH_COEXIST,
      getitem__doc__},
-    {"__sizeof__",      (PyCFunction)dict_sizeof,       METH_NOARGS,
+    {"__sizeof__",      (PyCFunction)(void(*)(void))dict_sizeof,       METH_NOARGS,
      sizeof__doc__},
     DICT_GET_METHODDEF
     DICT_SETDEFAULT_METHODDEF
     {"pop",         (PyCFunction)dict_pop,          METH_VARARGS,
      pop__doc__},
-    {"popitem",         (PyCFunction)dict_popitem,      METH_NOARGS,
+    {"popitem",         (PyCFunction)(void(*)(void))dict_popitem,      METH_NOARGS,
      popitem__doc__},
     {"keys",            dictkeys_new,                   METH_NOARGS,
     keys__doc__},
@@ -3111,7 +3111,7 @@
     items__doc__},
     {"values",          dictvalues_new,                 METH_NOARGS,
     values__doc__},
-    {"update",          (PyCFunction)dict_update,       METH_VARARGS | METH_KEYWORDS,
+    {"update",          (PyCFunction)(void(*)(void))dict_update, METH_VARARGS | METH_KEYWORDS,
      update__doc__},
     DICT_FROMKEYS_METHODDEF
     {"clear",           (PyCFunction)dict_clear,        METH_NOARGS,
@@ -3420,9 +3420,9 @@
 PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
 
 static PyMethodDef dictiter_methods[] = {
-    {"__length_hint__", (PyCFunction)dictiter_len, METH_NOARGS,
+    {"__length_hint__", (PyCFunction)(void(*)(void))dictiter_len, METH_NOARGS,
      length_hint_doc},
-     {"__reduce__", (PyCFunction)dictiter_reduce, METH_NOARGS,
+     {"__reduce__", (PyCFunction)(void(*)(void))dictiter_reduce, METH_NOARGS,
      reduce_doc},
     {NULL,              NULL}           /* sentinel */
 };
@@ -4209,7 +4209,7 @@
 static PyMethodDef dictkeys_methods[] = {
     {"isdisjoint",      (PyCFunction)dictviews_isdisjoint,  METH_O,
      isdisjoint_doc},
-    {"__reversed__",    (PyCFunction)dictkeys_reversed,    METH_NOARGS,
+    {"__reversed__",    (PyCFunction)(void(*)(void))dictkeys_reversed,    METH_NOARGS,
      reversed_keys_doc},
     {NULL,              NULL}           /* sentinel */
 };
@@ -4315,7 +4315,7 @@
 static PyMethodDef dictitems_methods[] = {
     {"isdisjoint",      (PyCFunction)dictviews_isdisjoint,  METH_O,
      isdisjoint_doc},
-    {"__reversed__",    (PyCFunction)dictitems_reversed,    METH_NOARGS,
+    {"__reversed__",    (PyCFunction)(void(*)(void))dictitems_reversed,    METH_NOARGS,
      reversed_items_doc},
     {NULL,              NULL}           /* sentinel */
 };
@@ -4396,7 +4396,7 @@
 "Return a reverse iterator over the dict values.");
 
 static PyMethodDef dictvalues_methods[] = {
-    {"__reversed__",    (PyCFunction)dictvalues_reversed,    METH_NOARGS,
+    {"__reversed__",    (PyCFunction)(void(*)(void))dictvalues_reversed,    METH_NOARGS,
      reversed_values_doc},
     {NULL,              NULL}           /* sentinel */
 };
diff --git a/Objects/memoryobject.c b/Objects/memoryobject.c
index 0f528ee..c1350b7 100644
--- a/Objects/memoryobject.c
+++ b/Objects/memoryobject.c
@@ -3086,7 +3086,7 @@
     {"tobytes",     (PyCFunction)memory_tobytes, METH_NOARGS, memory_tobytes_doc},
     {"hex",         (PyCFunction)memory_hex, METH_NOARGS, memory_hex_doc},
     {"tolist",      (PyCFunction)memory_tolist, METH_NOARGS, memory_tolist_doc},
-    {"cast",        (PyCFunction)memory_cast, METH_VARARGS|METH_KEYWORDS, memory_cast_doc},
+    {"cast",        (PyCFunction)(void(*)(void))memory_cast, METH_VARARGS|METH_KEYWORDS, memory_cast_doc},
     {"toreadonly",  (PyCFunction)memory_toreadonly, METH_NOARGS, memory_toreadonly_doc},
     {"__enter__",   memory_enter, METH_NOARGS, NULL},
     {"__exit__",    memory_exit, METH_VARARGS, NULL},
diff --git a/Objects/odictobject.c b/Objects/odictobject.c
index 0f54200..689062c 100644
--- a/Objects/odictobject.c
+++ b/Objects/odictobject.c
@@ -1311,7 +1311,7 @@
     {"__reduce__",      (PyCFunction)odict_reduce,      METH_NOARGS,
      odict_reduce__doc__},
     ORDEREDDICT_SETDEFAULT_METHODDEF
-    {"pop",             (PyCFunction)odict_pop,
+    {"pop",             (PyCFunction)(void(*)(void))odict_pop,
      METH_VARARGS | METH_KEYWORDS, odict_pop__doc__},
     ORDEREDDICT_POPITEM_METHODDEF
     {"keys",            odictkeys_new,                  METH_NOARGS,
@@ -1320,7 +1320,7 @@
      odict_values__doc__},
     {"items",           odictitems_new,                 METH_NOARGS,
      odict_items__doc__},
-    {"update",          (PyCFunction)odict_update, METH_VARARGS | METH_KEYWORDS,
+    {"update",          (PyCFunction)(void(*)(void))odict_update, METH_VARARGS | METH_KEYWORDS,
      odict_update__doc__},
     {"clear",           (PyCFunction)odict_clear,       METH_NOARGS,
      odict_clear__doc__},
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index 2345b7c..73d385b 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -3481,7 +3481,7 @@
 static PyMethodDef type_methods[] = {
     TYPE_MRO_METHODDEF
     TYPE___SUBCLASSES___METHODDEF
-    {"__prepare__", (PyCFunction)type_prepare,
+    {"__prepare__", (PyCFunction)(void(*)(void))type_prepare,
      METH_FASTCALL | METH_KEYWORDS | METH_CLASS,
      PyDoc_STR("__prepare__() -> dict\n"
                "used to create the namespace for the class statement")},
@@ -5944,7 +5944,7 @@
 }
 
 static struct PyMethodDef tp_new_methoddef[] = {
-    {"__new__", (PyCFunction)tp_new_wrapper, METH_VARARGS|METH_KEYWORDS,
+    {"__new__", (PyCFunction)(void(*)(void))tp_new_wrapper, METH_VARARGS|METH_KEYWORDS,
      PyDoc_STR("__new__($type, *args, **kwargs)\n--\n\n"
                "Create and return a new object.  "
                "See help(type) for accurate signature.")},
@@ -7140,7 +7140,7 @@
         }
         else if (Py_TYPE(descr) == &PyCFunction_Type &&
                  PyCFunction_GET_FUNCTION(descr) ==
-                 (PyCFunction)tp_new_wrapper &&
+                 (PyCFunction)(void(*)(void))tp_new_wrapper &&
                  ptr == (void**)&type->tp_new)
         {
             /* The __new__ wrapper is not a wrapper descriptor,
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 3da40dd..cdfc2f6 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -13948,7 +13948,7 @@
     UNICODE_ISIDENTIFIER_METHODDEF
     UNICODE_ISPRINTABLE_METHODDEF
     UNICODE_ZFILL_METHODDEF
-    {"format", (PyCFunction) do_string_format, METH_VARARGS | METH_KEYWORDS, format__doc__},
+    {"format", (PyCFunction)(void(*)(void)) do_string_format, METH_VARARGS | METH_KEYWORDS, format__doc__},
     {"format_map", (PyCFunction) do_string_format_map, METH_O, format_map__doc__},
     UNICODE___FORMAT___METHODDEF
     UNICODE_MAKETRANS_METHODDEF