diff --git a/Objects/longobject.c b/Objects/longobject.c
index 0bf6cee..6c47602 100644
--- a/Objects/longobject.c
+++ b/Objects/longobject.c
@@ -4811,6 +4811,12 @@
         }
         return PyLong_FromLong(0L);
     }
+    if (PyTuple_GET_SIZE(args) == 0) {
+        if (PyErr_Warn(PyExc_DeprecationWarning,
+                "Using 'x' as a keyword argument is deprecated; "
+                "specify the value as a positional argument instead") < 0)
+            return NULL;
+    }
     if (obase == NULL)
         return PyNumber_Long(x);