diff --git a/crc.py b/crc.py
index ad728fa..3720e8d 100644
--- a/crc.py
+++ b/crc.py
@@ -10,6 +10,7 @@
 import sys
 from dataclasses import dataclass
 from typing import (
+    Any,
     BinaryIO,
     ByteString,
     Iterable,
@@ -403,13 +404,13 @@ def verify(
 
 
 def _bytes_generator(
-    data: Union[int, ByteString, BinaryIO, Iterable[ByteString]]
+    data: Union[int, ByteString, BinaryIO, Iterable[ByteString]]  # type: ignore
 ) -> Iterable[bytes]:
     if isinstance(data, int):
         yield data.to_bytes(1, "big")
-    elif isinstance(data, ByteString):
-        yield bytes(data)
-    elif isinstance(data, (Iterable, BinaryIO)):
+    elif isinstance(data, ByteString):  # type: ignore
+        yield bytes(data)  # type: ignore
+    elif isinstance(data, (Iterable, BinaryIO)):  # type: ignore
         yield from (bytes(e) for e in data)
     else:
         raise TypeError(f"Unsupported parameter type: {type(data)}")
diff --git a/test/unit/test_crc.py b/test/unit/test_crc.py
index 89247ef..9dcd1f8 100644
--- a/test/unit/test_crc.py
+++ b/test/unit/test_crc.py
@@ -21,7 +21,7 @@
     create_lookup_table,
 )
 
-Fixture = namedtuple("TestData", "data checksum")
+Fixture = namedtuple("Fixture", "data checksum")
 
 
 class TemplateTest(unittest.TestCase):