diff --git a/aiokafka/structs.py b/aiokafka/structs.py
index 8e968b4b..3db1d20a 100644
--- a/aiokafka/structs.py
+++ b/aiokafka/structs.py
@@ -117,8 +117,8 @@ class RecordMetadata(NamedTuple):
     ""
 
 
-KT = TypeVar("KT", covariant=True)
-VT = TypeVar("VT", covariant=True)
+KT = TypeVar("KT")
+VT = TypeVar("VT")
 
 
 @dataclass