diff -r a29eaffa7d72 Lib/test/test_str.py
--- a/Lib/test/test_str.py	Tue Jun 25 00:48:02 2013 +0200
+++ b/Lib/test/test_str.py	Tue Jul 02 02:32:30 2013 +0200
@@ -428,6 +428,11 @@ 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
+        self.assertRaises(OverflowError, '{0:c}'.format, -1)
+        self.assertRaises(OverflowError, '{0:c}'.format, 256)
+
     def test_buffer_is_readonly(self):
         self.assertRaises(TypeError, sys.stdin.readinto, b"")
 
diff -r a29eaffa7d72 Misc/NEWS
--- a/Misc/NEWS	Tue Jun 25 00:48:02 2013 +0200
+++ b/Misc/NEWS	Tue Jul 02 02:32:30 2013 +0200
@@ -9,6 +9,9 @@ What's New in Python 2.7.6?
 Core and Builtins
 -----------------
 
+- Issue #7267: format(int, 'c') now raises OverflowError when the argument is
+  not in range(0, 256).
+
 - Issue #18184: PyUnicode_FromFormat() and PyUnicode_FromFormatV() now raise
   OverflowError when an argument of %c format is out of range.
 
diff -r a29eaffa7d72 Objects/stringlib/formatter.h
--- a/Objects/stringlib/formatter.h	Tue Jun 25 00:48:02 2013 +0200
+++ b/Objects/stringlib/formatter.h	Tue Jul 02 02:32:30 2013 +0200
@@ -788,6 +788,7 @@ 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,
@@ -803,6 +804,13 @@ format_int_or_long_internal(PyObject *va
             goto done;
         }
 #endif
+#else
+        if (x < 0 || x > 0xff) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "%c arg not in range(0x100)");
+            goto done;
+        }
+#endif
         numeric_char = (STRINGLIB_CHAR)x;
         pnumeric_chars = &numeric_char;
         n_digits = 1;