diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 4ce774b..b109ba7 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -1340,7 +1340,7 @@
 				Py_DECREF(stdin_encoding);
 				return NULL;
 			}
-			prompt = PyString_AsString(po);
+			prompt = PyUnicode_AsString(po);
 			if (prompt == NULL) {
 				Py_DECREF(stdin_encoding);
 				Py_DECREF(po);