diff --git a/Modules/_struct.c b/Modules/_struct.c
index b4febf7..b5fbc43 100644
--- a/Modules/_struct.c
+++ b/Modules/_struct.c
@@ -1817,15 +1817,12 @@
 strings.");
 
 static PyObject *
-s_pack(PyObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
+s_pack(PyObject *self, PyObject **args, Py_ssize_t nargs)
 {
     PyStructObject *soself;
     PyObject *result;
 
     /* Validate arguments. */
-    if (!_PyArg_NoStackKeywords("pack", kwnames)) {
-        return NULL;
-    }
     soself = (PyStructObject *)self;
     assert(PyStruct_Check(self));
     assert(soself->s_codes != NULL);
@@ -1859,16 +1856,13 @@
 help(struct) for more on format strings.");
 
 static PyObject *
-s_pack_into(PyObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
+s_pack_into(PyObject *self, PyObject **args, Py_ssize_t nargs)
 {
     PyStructObject *soself;
     Py_buffer buffer;
     Py_ssize_t offset;
 
     /* Validate arguments.  +1 is for the first arg as buffer. */
-    if (!_PyArg_NoStackKeywords("pack_into", kwnames)) {
-        return NULL;
-    }
     soself = (PyStructObject *)self;
     assert(PyStruct_Check(self));
     assert(soself->s_codes != NULL);
@@ -2126,15 +2120,11 @@
 to the format string.  See help(struct) for more on format strings.");
 
 static PyObject *
-pack(PyObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
+pack(PyObject *self, PyObject **args, Py_ssize_t nargs)
 {
     PyObject *s_object = NULL;
     PyObject *format, *result;
 
-    if (!_PyArg_NoStackKeywords("pack", kwnames)) {
-        return NULL;
-    }
-
     if (nargs == 0) {
         PyErr_SetString(PyExc_TypeError, "missing format argument");
         return NULL;
@@ -2144,7 +2134,7 @@
     if (!cache_struct_converter(format, &s_object)) {
         return NULL;
     }
-    result = s_pack(s_object, args + 1, nargs - 1, kwnames);
+    result = s_pack(s_object, args + 1, nargs - 1);
     Py_DECREF(s_object);
     return result;
 }
@@ -2158,15 +2148,11 @@
 on format strings.");
 
 static PyObject *
-pack_into(PyObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
+pack_into(PyObject *self, PyObject **args, Py_ssize_t nargs)
 {
     PyObject *s_object = NULL;
     PyObject *format, *result;
 
-    if (!_PyArg_NoStackKeywords("pack_into", kwnames)) {
-        return NULL;
-    }
-
     if (nargs == 0) {
         PyErr_SetString(PyExc_TypeError, "missing format argument");
         return NULL;
@@ -2176,7 +2162,7 @@
     if (!cache_struct_converter(format, &s_object)) {
         return NULL;
     }
-    result = s_pack_into(s_object, args + 1, nargs - 1, kwnames);
+    result = s_pack_into(s_object, args + 1, nargs - 1);
     Py_DECREF(s_object);
     return result;
 }