diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 5704bcc..0f1794a 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -972,7 +972,7 @@ print_exception(PyObject *f, PyObject *value)
         {
             Py_XDECREF(modulename);
             PyErr_Clear();
-            err = PyFile_WriteString("<unknown>", f);
+            err = PyFile_WriteString("<unknown>.", f);
         }
         else {
             if (!_PyUnicode_EqualToASCIIId(modulename, &PyId_builtins))