diff --git a/mypy.ini b/mypy.ini
index 674f77df58..1494f91bad 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -5,4 +5,7 @@ disallow_untyped_defs = True
 ignore_missing_imports = True
 disable_error_code = attr-defined,import-untyped,name-defined
 follow_imports = silent
-warn_no_return = False
\ No newline at end of file
+warn_no_return = False
+
+[mypy-*.tests.*]
+disallow_untyped_defs = False
\ No newline at end of file
diff --git a/plan/tests/__init__.py b/plan/tests/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/plan/test_plan.py b/plan/tests/test_plan.py
similarity index 100%
rename from plan/test_plan.py
rename to plan/tests/test_plan.py