diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 13349cc7bb1..022d432284f 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -496,7 +496,7 @@ builtin_format(PyObject *self, PyObject *args)
     PyObject *format_spec = NULL;
 
     if (!PyArg_ParseTuple(args, "O|U:format", &value, &format_spec))
-    return NULL;
+        return NULL;
 
     return PyObject_Format(value, format_spec);
 }