diff --git a/Objects/tupleobject.c b/Objects/tupleobject.c
index 5bcadeb..c2696c7 100644
--- a/Objects/tupleobject.c
+++ b/Objects/tupleobject.c
@@ -654,6 +654,12 @@
         return tuple_subtype_new(type, args, kwds);
     if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O:tuple", kwlist, &arg))
         return NULL;
+    if (arg != NULL && PyTuple_GET_SIZE(args) == 0) {
+        if (PyErr_Warn(PyExc_DeprecationWarning,
+                "Using 'sequence' as a keyword argument is deprecated; "
+                "specify the value as a positional argument instead") < 0)
+            return NULL;
+    }
 
     if (arg == NULL)
         return PyTuple_New(0);