diff --git a/Objects/bytearrayobject.c b/Objects/bytearrayobject.c
--- a/Objects/bytearrayobject.c
+++ b/Objects/bytearrayobject.c
@@ -274,29 +274,16 @@ PyByteArray_Concat(PyObject *a, PyObject
   done:
     if (va.len != -1)
         PyBuffer_Release(&va);
     if (vb.len != -1)
         PyBuffer_Release(&vb);
     return (PyObject *)result;
 }
 
-static PyObject *
-bytearray_format(PyByteArrayObject *self, PyObject *args)
-{
-    if (self == NULL || !PyByteArray_Check(self)) {
-        PyErr_BadInternalCall();
-        return NULL;
-    }
-
-    return _PyBytes_FormatEx(PyByteArray_AS_STRING(self),
-                             PyByteArray_GET_SIZE(self),
-                             args, 1);
-}
-
 /* Functions stuffed into the type object */
 
 static Py_ssize_t
 bytearray_length(PyByteArrayObject *self)
 {
     return Py_SIZE(self);
 }
 
@@ -3009,17 +2996,17 @@ bytearray_methods[] = {
     {NULL}
 };
 
 static PyObject *
 bytearray_mod(PyObject *v, PyObject *w)
 {
     if (!PyByteArray_Check(v))
         Py_RETURN_NOTIMPLEMENTED;
-    return bytearray_format((PyByteArrayObject *)v, w);
+    return _PyBytes_FormatEx(PyByteArray_AS_STRING(v), PyByteArray_GET_SIZE(v), w, 1);
 }
 
 static PyNumberMethods bytearray_as_number = {
     0,              /*nb_add*/
     0,              /*nb_subtract*/
     0,              /*nb_multiply*/
     bytearray_mod,  /*nb_remainder*/
 };