diff --git a/Objects/longobject.c b/Objects/longobject.c
index 7437155..c3dc59e 100644
--- a/Objects/longobject.c
+++ b/Objects/longobject.c
@@ -4808,7 +4808,7 @@
         return NULL;
     if ((base != 0 && base < 2) || base > 36) {
         PyErr_SetString(PyExc_ValueError,
-                        "int() base must be >= 2 and <= 36");
+                        "int() base must be >= 2 and <= 36, or 0");
         return NULL;
     }