diff -r 19c5fb692b39 Lib/test/test_str.py
--- a/Lib/test/test_str.py	Tue May 12 19:15:53 2015 -0400
+++ b/Lib/test/test_str.py	Wed May 13 11:59:24 2015 +0300
@@ -428,6 +428,13 @@ class StrTest(
         self.assertEqual('{:{f}}{g}{}'.format(1, 3, g='g', f=2), ' 1g3')
         self.assertEqual('{f:{}}{}{g}'.format(2, 4, f=1, g='g'), ' 14g')
 
+    def test_format_c_overflow(self):
+        # issue #7267
+        with test_support.check_py3k_warnings():
+            '{0:c}'.format(-1)
+        with test_support.check_py3k_warnings():
+            '{0:c}'.format(256)
+
     def test_buffer_is_readonly(self):
         self.assertRaises(TypeError, sys.stdin.readinto, b"")
 
diff -r 19c5fb692b39 Misc/NEWS
--- a/Misc/NEWS	Tue May 12 19:15:53 2015 -0400
+++ b/Misc/NEWS	Wed May 13 11:59:24 2015 +0300
@@ -10,6 +10,9 @@ What's New in Python 2.7.11?
 Core and Builtins
 -----------------
 
+- Issue #7267: format(int, 'c') now emits Py3k deprecation warning when the
+  argument is not in range(0, 256).
+
 Library
 -------
 
diff -r 19c5fb692b39 Objects/stringlib/formatter.h
--- a/Objects/stringlib/formatter.h	Tue May 12 19:15:53 2015 -0400
+++ b/Objects/stringlib/formatter.h	Wed May 13 11:59:24 2015 +0300
@@ -789,6 +789,7 @@ format_int_or_long_internal(PyObject *va
         x = PyLong_AsLong(value);
         if (x == -1 && PyErr_Occurred())
             goto done;
+#if STRINGLIB_IS_UNICODE
 #ifdef Py_UNICODE_WIDE
         if (x < 0 || x > 0x10ffff) {
             PyErr_SetString(PyExc_OverflowError,
@@ -804,6 +805,12 @@ format_int_or_long_internal(PyObject *va
             goto done;
         }
 #endif
+#else
+        if (x < 0 || x > 0xff) {
+            if (PyErr_WarnPy3k("%c arg not in range(0x100)", 1) < 0)
+                goto done;
+        }
+#endif
         numeric_char = (STRINGLIB_CHAR)x;
         pnumeric_chars = &numeric_char;
         n_digits = 1;