diff --git a/CHANGES b/CHANGES
index 4bf4c2c51..acad89d49 100644
--- a/CHANGES
+++ b/CHANGES
@@ -75,7 +75,7 @@ Bugs fixed
 Testing
 --------
 
-Release 3.0.3 (in development)
+Release 3.0.4 (in development)
 ==============================
 
 Dependencies
@@ -90,6 +90,20 @@ Deprecated
 Features added
 --------------
 
+Bugs fixed
+----------
+
+* #7567: autodoc: parametrized types are shown twice for generic types
+
+Testing
+--------
+
+Release 3.0.3 (released Apr 26, 2020)
+=====================================
+
+Features added
+--------------
+
 * C, parse array declarators with static, qualifiers, and VLA specification.
 
 Bugs fixed
@@ -98,9 +112,6 @@ Bugs fixed
 * #7516: autodoc: crashes if target object raises an error on accessing
   its attributes
 
-Testing
---------
-
 Release 3.0.2 (released Apr 19, 2020)
 =====================================
 
diff --git a/sphinx/util/typing.py b/sphinx/util/typing.py
index eb38d232c..4644b1378 100644
--- a/sphinx/util/typing.py
+++ b/sphinx/util/typing.py
@@ -75,8 +75,13 @@ def _stringify_py37(annotation: Any) -> str:
             qualname = stringify(annotation.__origin__)  # ex. Union
     elif hasattr(annotation, '__qualname__'):
         qualname = '%s.%s' % (module, annotation.__qualname__)
+    elif hasattr(annotation, '__origin__'):
+        # instantiated generic provided by a user
+        qualname = stringify(annotation.__origin__)
     else:
-        qualname = repr(annotation)
+        # we weren't able to extract the base type, appending arguments would
+        # only make them appear twice
+        return repr(annotation)
 
     if getattr(annotation, '__args__', None):
         if qualname == 'Union':
@@ -91,7 +96,7 @@ def _stringify_py37(annotation: Any) -> str:
             return '%s[[%s], %s]' % (qualname, args, returns)
         elif str(annotation).startswith('typing.Annotated'):  # for py39+
             return stringify(annotation.__args__[0])
-        elif annotation._special:
+        elif getattr(annotation, '_special', False):
             return qualname
         else:
             args = ', '.join(stringify(a) for a in annotation.__args__)
diff --git a/tests/test_util_typing.py b/tests/test_util_typing.py
index f6fd35fb0..41d2a19c2 100644
--- a/tests/test_util_typing.py
+++ b/tests/test_util_typing.py
@@ -10,7 +10,7 @@
 
 import sys
 from numbers import Integral
-from typing import Any, Dict, List, TypeVar, Union, Callable, Tuple, Optional
+from typing import Any, Dict, List, TypeVar, Union, Callable, Tuple, Optional, Generic
 
 import pytest
 
@@ -24,6 +24,11 @@ class MyClass1:
 class MyClass2(MyClass1):
     __qualname__ = '<MyClass2>'
 
+T = TypeVar('T')
+
+class MyList(List[T]):
+    pass
+
 
 def test_stringify():
     assert stringify(int) == "int"
@@ -42,6 +47,7 @@ def test_stringify_type_hints_containers():
     assert stringify(Tuple[str, str, str]) == "Tuple[str, str, str]"
     assert stringify(Tuple[str, ...]) == "Tuple[str, ...]"
     assert stringify(List[Dict[str, Tuple]]) == "List[Dict[str, Tuple]]"
+    assert stringify(MyList[Tuple[int, int]]) == "test_util_typing.MyList[Tuple[int, int]]"
 
 
 @pytest.mark.skipif(sys.version_info < (3, 9), reason='python 3.9+ is required.')