diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index c5acd1b..75ad9f0 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -8644,7 +8644,7 @@
 		if (!isnumok) {
 			PyErr_Format(PyExc_TypeError, 
 			    "%%%c format: a number is required, "
-			    "not %.200s", c, Py_TYPE(v)->tp_name);
+                                     "not %.200s", (char)c, Py_TYPE(v)->tp_name);
 			goto onError;
 		}
 		if (flags & F_ZERO)