diff -r 116bd550e309 Objects/codeobject.c
--- a/Objects/codeobject.c	Tue Nov 19 23:56:34 2013 +0100
+++ b/Objects/codeobject.c	Wed Nov 20 00:07:34 2013 +0100
@@ -108,7 +108,7 @@ PyCode_New(int argcount, int kwonlyargco
             for (j = 0; j < total_args; j++) {
                 PyObject *arg = PyTuple_GET_ITEM(varnames, j);
                 if (!PyUnicode_Compare(cell, arg)) {
-                    cell2arg[i] = j;
+                    cell2arg[i] = Py_SAFE_DOWNCAST(j, Py_ssize_t, unsigned char);
                     used_cell2arg = 1;
                     break;
                 }
diff -r 116bd550e309 Objects/funcobject.c
--- a/Objects/funcobject.c	Tue Nov 19 23:56:34 2013 +0100
+++ b/Objects/funcobject.c	Wed Nov 20 00:07:34 2013 +0100
@@ -597,7 +597,8 @@ function_call(PyObject *func, PyObject *
     PyObject *argdefs;
     PyObject *kwtuple = NULL;
     PyObject **d, **k;
-    Py_ssize_t nk, nd;
+    Py_ssize_t na, nk, nd;
+    int na_int, nk_int, nd_int;
 
     argdefs = PyFunction_GET_DEFAULTS(func);
     if (argdefs != NULL && PyTuple_Check(argdefs)) {
@@ -608,6 +609,7 @@ function_call(PyObject *func, PyObject *
         d = NULL;
         nd = 0;
     }
+    nd_int = Py_SAFE_DOWNCAST(nd, Py_ssize_t, int);
 
     if (kw != NULL && PyDict_Check(kw)) {
         Py_ssize_t pos, i;
@@ -628,12 +630,17 @@ function_call(PyObject *func, PyObject *
         k = NULL;
         nk = 0;
     }
+    nk_int = Py_SAFE_DOWNCAST(nk, Py_ssize_t, int);
+
+    na = PyTuple_GET_SIZE(arg);
+    na_int = Py_SAFE_DOWNCAST(na, Py_ssize_t, int);
 
     result = PyEval_EvalCodeEx(
         PyFunction_GET_CODE(func),
         PyFunction_GET_GLOBALS(func), (PyObject *)NULL,
-        &PyTuple_GET_ITEM(arg, 0), PyTuple_GET_SIZE(arg),
-        k, nk, d, nd,
+        &PyTuple_GET_ITEM(arg, 0), na_int,
+        k, nk_int,
+        d, nd_int,
         PyFunction_GET_KW_DEFAULTS(func),
         PyFunction_GET_CLOSURE(func));
 
diff -r 116bd550e309 Python/ceval.c
--- a/Python/ceval.c	Tue Nov 19 23:56:34 2013 +0100
+++ b/Python/ceval.c	Wed Nov 20 00:07:34 2013 +0100
@@ -114,7 +114,7 @@ static PyObject * do_call(PyObject *, Py
 static PyObject * ext_do_call(PyObject *, PyObject ***, int, int, int);
 static PyObject * update_keyword_args(PyObject *, int, PyObject ***,
                                       PyObject *);
-static PyObject * update_star_args(int, int, PyObject *, PyObject ***);
+static PyObject * update_star_args(int, Py_ssize_t, PyObject *, PyObject ***);
 static PyObject * load_args(PyObject ***, int);
 #define CALL_FLAG_VAR 1
 #define CALL_FLAG_KW 2
@@ -4287,7 +4287,8 @@ fast_function(PyObject *func, PyObject *
     PyObject *argdefs = PyFunction_GET_DEFAULTS(func);
     PyObject *kwdefs = PyFunction_GET_KW_DEFAULTS(func);
     PyObject **d = NULL;
-    int nd = 0;
+    Py_ssize_t nd = 0;
+    int nd_int;
 
     PCALL(PCALL_FUNCTION);
     PCALL(PCALL_FAST_FUNCTION);
@@ -4328,9 +4329,14 @@ fast_function(PyObject *func, PyObject *
         d = &PyTuple_GET_ITEM(argdefs, 0);
         nd = Py_SIZE(argdefs);
     }
+    nd_int = Py_SAFE_DOWNCAST(nd, Py_ssize_t, int);
+
     return PyEval_EvalCodeEx((PyObject*)co, globals,
-                             (PyObject *)NULL, (*pp_stack)-n, na,
-                             (*pp_stack)-2*nk, nk, d, nd, kwdefs,
+                             (PyObject *)NULL,
+                             (*pp_stack)-n, na,
+                             (*pp_stack)-2*nk, nk,
+                             d, nd_int,
+                             kwdefs,
                              PyFunction_GET_CLOSURE(func));
 }
 
@@ -4375,7 +4381,7 @@ update_keyword_args(PyObject *orig_kwdic
 }
 
 static PyObject *
-update_star_args(int nstack, int nstar, PyObject *stararg,
+update_star_args(int nstack, Py_ssize_t nstar, PyObject *stararg,
                  PyObject ***pp_stack)
 {
     PyObject *callargs, *w;
@@ -4385,7 +4391,7 @@ update_star_args(int nstack, int nstar, 
         return NULL;
     }
     if (nstar) {
-        int i;
+        Py_ssize_t i;
         for (i = 0; i < nstar; i++) {
             PyObject *a = PyTuple_GET_ITEM(stararg, i);
             Py_INCREF(a);
@@ -4460,7 +4466,7 @@ call_fail:
 static PyObject *
 ext_do_call(PyObject *func, PyObject ***pp_stack, int flags, int na, int nk)
 {
-    int nstar = 0;
+    Py_ssize_t nstar = 0;
     PyObject *callargs = NULL;
     PyObject *stararg = NULL;
     PyObject *kwdict = NULL;