diff --git a/tools/run-mypy b/tools/run-mypy
index 48a1ada..eb60563 100755
--- a/tools/run-mypy
+++ b/tools/run-mypy
@@ -20,7 +20,6 @@ sys.path.append(os.path.dirname(TOOLS_DIR))
 
 exclude = """
 zulip/integrations/perforce/git_p4.py
-zulip/tests/__init__.py
 zulip/tests/test_default_arguments.py
 
 zulip_bots/zulip_bots/bots
diff --git a/zulip/tests/__init__.py b/zulip/tests/__init__.py
index bb61062..9c5ca6a 100644
--- a/zulip/tests/__init__.py
+++ b/zulip/tests/__init__.py
@@ -1,2 +1,4 @@
 import pkgutil
-__path__ = pkgutil.extend_path(__path__, __name__)
+from typing import Iterable, Text
+
+__path__ = pkgutil.extend_path(__path__, __name__)  # type: Iterable[Text]