diff --git a/mypy.ini b/mypy.ini
index a5e2bb6ac9..1c36f6ba6d 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -62,7 +62,7 @@ ignore_missing_imports = True
 [mypy-linter_lib.printer]
 ignore_missing_imports = True
 
-[mypy-lister,.lister]
+[mypy-zulint,zulint.lister,zulint.lister.*]
 ignore_missing_imports = True
 
 
diff --git a/tools/check-templates b/tools/check-templates
index 78d127386b..ee0e949f82 100755
--- a/tools/check-templates
+++ b/tools/check-templates
@@ -10,7 +10,7 @@ import logging
 from lib import sanity_check
 sanity_check.check_venv(__file__)
 
-import lister
+from zulint import lister
 from typing import cast, Callable, Dict, Iterable, List
 
 EXCLUDED_FILES = [
diff --git a/tools/html-grep b/tools/html-grep
index 2fe5826048..881aa41b9b 100755
--- a/tools/html-grep
+++ b/tools/html-grep
@@ -9,7 +9,7 @@ from typing import List
 from lib import sanity_check
 sanity_check.check_venv(__file__)
 
-import lister
+from zulint import lister
 
 USAGE = '''
     This file greps HTML files for keywords in a context-sensitive manner.
diff --git a/tools/lint b/tools/lint
index 9e1a33a2ef..8e7c4cf08b 100755
--- a/tools/lint
+++ b/tools/lint
@@ -13,7 +13,7 @@ from linter_lib.printer import print_err, colors
 from lib import sanity_check
 sanity_check.check_venv(__file__)
 
-import lister
+from zulint import lister
 from typing import cast, Callable, Dict, Iterator, List
 
 
diff --git a/tools/replacer b/tools/replacer
index 95828daef3..9d73d252f4 100755
--- a/tools/replacer
+++ b/tools/replacer
@@ -4,7 +4,7 @@ import argparse
 from subprocess import check_call
 from typing import List, Dict, Union
 
-from .lister import list_files
+from zulint.lister import list_files
 
 def do_replace(listing, old_string, new_string):
     # type: (Union[Dict[str, List[str]], List[str]], str, str) -> None
diff --git a/tools/run-mypy b/tools/run-mypy
index ccf707cfe0..fafe3dd980 100755
--- a/tools/run-mypy
+++ b/tools/run-mypy
@@ -6,7 +6,7 @@ import sys
 import argparse
 import subprocess
 
-import lister
+from zulint import lister
 from typing import cast, Dict, List
 
 TOOLS_DIR = os.path.dirname(os.path.abspath(__file__))
diff --git a/tools/zulint/__init__.py b/tools/zulint/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tools/lister.py b/tools/zulint/lister.py
similarity index 100%
rename from tools/lister.py
rename to tools/zulint/lister.py