diff --git a/setup.py b/setup.py
index d486e91..99251d4 100644
--- a/setup.py
+++ b/setup.py
@@ -12,7 +12,7 @@
     long_description=long_description,
     long_description_content_type="text/markdown",
     url="https://github.com/andrewbihl/bsed",
-    packages=setuptools.find_packages(exclude="tests"),
+    packages=setuptools.find_packages(exclude=("tests",)),
     classifiers=[
         "Programming Language :: Python :: 3",
         "License :: OSI Approved :: MIT License",