diff --git a/amundsen_common/utils/__init__.py b/amundsen_common/utils/__init__.py
deleted file mode 100644
index f3145d7..0000000
--- a/amundsen_common/utils/__init__.py
+++ /dev/null
@@ -1,2 +0,0 @@
-# Copyright Contributors to the Amundsen project.
-# SPDX-License-Identifier: Apache-2.0
diff --git a/amundsen_common/utils/utils.py b/amundsen_common/utils/utils.py
deleted file mode 100644
index b4780e9..0000000
--- a/amundsen_common/utils/utils.py
+++ /dev/null
@@ -1,12 +0,0 @@
-# Copyright Contributors to the Amundsen project.
-# SPDX-License-Identifier: Apache-2.0
-
-from typing import Optional, TypeVar
-
-X = TypeVar('X')
-
-
-def check_not_none(x: Optional[X], *, message: str = 'is None') -> X:
-    if x is None:
-        raise RuntimeError(message)
-    return x
diff --git a/setup.cfg b/setup.cfg
index 1f621cd..e47822b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -35,8 +35,16 @@ check_untyped_defs = true
 disallow_any_generics = true
 disallow_incomplete_defs = true
 disallow_untyped_defs = true
-ignore_missing_imports = true
 no_implicit_optional = true
 
+[mypy-marshmallow.*]
+ignore_missing_imports = true
+
+[mypy-marshmallow_annotations.*]
+ignore_missing_imports = true
+
+[mypy-setuptools.*]
+ignore_missing_imports = true
+
 [mypy-tests.*]
 disallow_untyped_defs = false
diff --git a/tests/unit/utils/__init__.py b/tests/unit/utils/__init__.py
deleted file mode 100644
index f3145d7..0000000
--- a/tests/unit/utils/__init__.py
+++ /dev/null
@@ -1,2 +0,0 @@
-# Copyright Contributors to the Amundsen project.
-# SPDX-License-Identifier: Apache-2.0