diff --git a/Include/abstract.h b/Include/abstract.h
index 961279d4700..6647be774a9 100644
--- a/Include/abstract.h
+++ b/Include/abstract.h
@@ -193,8 +193,7 @@ PyAPI_FUNC(int) _PyStack_UnpackDict(
     Py_ssize_t nargs,
     PyObject *kwargs,
     PyObject ***p_stack,
-    PyObject **p_kwnames,
-    PyObject *func);
+    PyObject **p_kwnames);
 
 /* Suggested size (number of positional arguments) for arrays of PyObject*
    allocated on a C stack to avoid allocating memory on the heap memory. Such
diff --git a/Objects/abstract.c b/Objects/abstract.c
index ee50f02057e..682263d7bcb 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -2423,7 +2423,7 @@ _PyStack_AsDict(PyObject **values, PyObject *kwnames)
 
 int
 _PyStack_UnpackDict(PyObject **args, Py_ssize_t nargs, PyObject *kwargs,
-                    PyObject ***p_stack, PyObject **p_kwnames, PyObject *func)
+                    PyObject ***p_stack, PyObject **p_kwnames)
 {
     PyObject **stack, **kwstack;
     Py_ssize_t nkwargs;
diff --git a/Objects/methodobject.c b/Objects/methodobject.c
index 7bff6a037b0..1d55a0cd486 100644
--- a/Objects/methodobject.c
+++ b/Objects/methodobject.c
@@ -240,8 +240,7 @@ _PyCFunction_FastCallDict(PyObject *func_obj, PyObject **args, Py_ssize_t nargs,
         PyObject *kwnames;
         _PyCFunctionFast fastmeth = (_PyCFunctionFast)meth;
 
-        if (_PyStack_UnpackDict(args, nargs, kwargs,
-                                &stack, &kwnames, func_obj) < 0) {
+        if (_PyStack_UnpackDict(args, nargs, kwargs, &stack, &kwnames) < 0) {
             return NULL;
         }