diff --git a/Objects/setobject.c b/Objects/setobject.c
index f6ea441..d85a28d 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -2303,7 +2303,7 @@
 	/* Exercise direct iteration */
 	i = 0, count = 0;
 	while (_PySet_Next((PyObject *)dup, &i, &x)) {
-		s = PyString_AsString(x);
+		s = PyUnicode_AsString(x);
 		assert(s && (s[0] == 'a' || s[0] == 'b' || s[0] == 'c'));
 		count++;
 	}