diff --git a/flake8_typehinting/flake8_typehinting.py b/flake8_typehinting/flake8_typehinting.py
index c1b7ef1..60884cc 100644
--- a/flake8_typehinting/flake8_typehinting.py
+++ b/flake8_typehinting/flake8_typehinting.py
@@ -35,7 +35,7 @@ def visit_FunctionDef(self, node: ast.FunctionDef) -> None:  # NOQA N802
     def _check_th_100(self, node: ast.FunctionDef) -> None:
         """Check for TH100."""
         for arg in node.args.args:
-            if not arg.arg == 'self' and arg.annotation is None:
+            if arg.arg not in ('self', 'cls') and arg.annotation is None:
                 self.problems.append((node.lineno, node.col_offset, f'{TH100} ({arg.arg})'))
 
     def _check_th_101(self, node: ast.FunctionDef) -> None:
diff --git a/tests/test_flake8_typehinting.py b/tests/test_flake8_typehinting.py
index a212944..ad8e60f 100644
--- a/tests/test_flake8_typehinting.py
+++ b/tests/test_flake8_typehinting.py
@@ -76,3 +76,9 @@ def test_type_hinting_in_function_return_correct() -> None:
     """Test type hinting in function definitions."""
     ret = _results('def my_func(y: int, x: str = "1") -> int:\n    return 1')
     assert ret == set()
+
+
+def test_type_hinting_in_function_definition_cls() -> None:
+    """Test type hinting in function definitions."""
+    ret = _results('def my_func(cls, y: int, x="1") -> None:\n    print(x)')
+    assert ret == {'1:0 TH100 function missing type hints for arguments (x)'}