diff --git a/jedi/inference/gradual/base.py b/jedi/inference/gradual/base.py
index cd9533f3..ce574297 100644
--- a/jedi/inference/gradual/base.py
+++ b/jedi/inference/gradual/base.py
@@ -146,6 +146,9 @@ class DefineGenericBaseClass(LazyValueWrapper):
             ) for class_set1, class_set2 in zip(given_params1, given_params2)
         )
 
+    def get_signatures(self):
+        return []
+
     def __repr__(self):
         return '<%s: %s%s>' % (
             self.__class__.__name__,
diff --git a/test/test_inference/test_signature.py b/test/test_inference/test_signature.py
index df2f3339..49e9894e 100644
--- a/test/test_inference/test_signature.py
+++ b/test/test_inference/test_signature.py
@@ -114,6 +114,9 @@ class X:
          'TypeVar(name: str, *constraints: Type[Any], bound: Union[None, Type[Any], str]=..., '
          'covariant: bool=..., contravariant: bool=...)'),
         ('from typing import List\nList(', None),
+        ('from typing import List\nList[int](', None),
+        ('from typing import Tuple\nTuple(', None),
+        ('from typing import Tuple\nTuple[int](', None),
     ]
 )
 def test_tree_signature(Script, environment, code, expected):
@@ -148,7 +151,7 @@ def test_tree_signature(Script, environment, code, expected):
         ('full_redirect(C)', 'z, *, c'),
         ('full_redirect(C())', 'y'),
         ('full_redirect(G)', 't: T'),
-        ('full_redirect(G[str])', 't: T'),
+        ('full_redirect(G[str])', '*args, **kwargs'),
         ('D', 'D(a, z, /)'),
         ('D()', 'D(x, y)'),
         ('D().foo', 'foo(a, *, bar, z, **kwargs)'),