diff --git a/jedi/inference/gradual/annotation.py b/jedi/inference/gradual/annotation.py
index c1ef2667..60eb06bd 100644
--- a/jedi/inference/gradual/annotation.py
+++ b/jedi/inference/gradual/annotation.py
@@ -12,7 +12,7 @@ from parso import ParserSyntaxError, parse
 from jedi._compatibility import force_unicode, Parameter
 from jedi.inference.cache import inference_state_method_cache
 from jedi.inference.base_value import ValueSet, NO_VALUES
-from jedi.inference.gradual.base import DefineGenericBase, GenericClass, BaseTypingInstance
+from jedi.inference.gradual.base import DefineGenericBase, GenericClass
 from jedi.inference.gradual.generics import TupleGenericManager
 from jedi.inference.gradual.type_var import TypeVar
 from jedi.inference.helpers import is_string
@@ -350,7 +350,7 @@ def merge_pairwise_generics(annotation_value, annotated_argument_class):
 
     type_var_dict = {}
 
-    if not isinstance(annotated_argument_class, (DefineGenericBase)):
+    if not isinstance(annotated_argument_class, DefineGenericBase):
         return type_var_dict
 
     annotation_generics = annotation_value.get_generics()
diff --git a/jedi/inference/gradual/base.py b/jedi/inference/gradual/base.py
index 14b133d3..73697a28 100644
--- a/jedi/inference/gradual/base.py
+++ b/jedi/inference/gradual/base.py
@@ -396,10 +396,6 @@ class BaseTypingInstance(LazyValueWrapper):
     def name(self):
         return ValueName(self, self._tree_name)
 
-    @inference_state_method_cache()
-    def get_generics(self):
-        return self._generics_manager.to_tuple()
-
     def _get_wrapped_value(self):
         object_, = builtin_from_name(self.inference_state, u'object').execute_annotation()
         return object_
diff --git a/jedi/inference/gradual/typing.py b/jedi/inference/gradual/typing.py
index fccece66..eb64c1a9 100644
--- a/jedi/inference/gradual/typing.py
+++ b/jedi/inference/gradual/typing.py
@@ -325,7 +325,7 @@ class Tuple(BaseTypingInstance):
             # The parameter annotation is of the form `Tuple[T, ...]`,
             # so we treat the incoming tuple like a iterable sequence
             # rather than a positional container of elements.
-            return self.get_generics()[0].infer_type_vars(
+            return self._class_value.get_generics()[0].infer_type_vars(
                 value_set.merge_types_of_iterate(),
             )
 
@@ -348,7 +348,7 @@ class Tuple(BaseTypingInstance):
                 py_class = method()
                 merge_type_var_dicts(
                     type_var_dict,
-                    merge_pairwise_generics(self, py_class),
+                    merge_pairwise_generics(self._class_value, py_class),
                 )
 
             return type_var_dict