diff --git a/src/test_typing_extensions.py b/src/test_typing_extensions.py
index 8c2726f8..d028a3a7 100644
--- a/src/test_typing_extensions.py
+++ b/src/test_typing_extensions.py
@@ -5401,6 +5401,18 @@ def test_invalid_uses(self):
             ):
                 Concatenate[1, P]
 
+    @skipUnless(TYPING_3_10_0, "Missing backported to <=3.9. See issue #48")
+    def test_alias_subscription_with_ellipsis(self):
+        P = ParamSpec('P')
+        X = Callable[Concatenate[int, P], Any]
+
+        C1 = X[...]
+        self.assertEqual(C1.__parameters__, ())
+        with self.subTest("Compare Concatenate[int, ...]"):
+            if sys.version_info[:2] == (3, 10):
+                self.skipTest("Needs Issue #110 | PR # 442: construct Concatenate with ...")
+            self.assertEqual(get_args(C1), (Concatenate[int, ...], Any))
+
     def test_basic_introspection(self):
         P = ParamSpec('P')
         C1 = Concatenate[int, P]
diff --git a/src/typing_extensions.py b/src/typing_extensions.py
index 5bf4f2dc..fb836461 100644
--- a/src/typing_extensions.py
+++ b/src/typing_extensions.py
@@ -1795,7 +1795,24 @@ def __parameters__(self):
             return tuple(
                 tp for tp in self.__args__ if isinstance(tp, (typing.TypeVar, ParamSpec))
             )
+# 3.10+
+else:
+    _ConcatenateGenericAlias = typing._ConcatenateGenericAlias
 
+    # 3.10
+    # Monkey patch to not raise TypeError on python3.10 for ellipsis parameter
+    if sys.version_info < (3, 11):
+        def _copy_with_support_ellipsis(self, params):
+            if isinstance(params[-1], (list, tuple)):
+                return (*params[:-1], *params[-1])
+            if isinstance(params[-1], _ConcatenateGenericAlias):
+                params = (*params[:-1], *params[-1].__args__)
+            elif not (params[-1] is ... or isinstance(params[-1], ParamSpec)):
+                raise TypeError("The last parameter to Concatenate should be a "
+                        "ParamSpec variable or ellipsis.")
+            return super(_ConcatenateGenericAlias, self).copy_with(params)
+
+        _ConcatenateGenericAlias.copy_with = _copy_with_support_ellipsis
 
 # 3.8-3.9
 @typing._tp_cache