diff --git a/setup.py b/setup.py
index 6dcb90c8e..84c27fce5 100644
--- a/setup.py
+++ b/setup.py
@@ -59,7 +59,7 @@ install_requires = [
 # So this dependency is not added for old Linux distributions with old setuptools,
 # in order to allow these systems to build certbot from sources.
 if StrictVersion(setuptools_version) >= StrictVersion('36.2'):
-    install_requires.append('pywin32 ; sys_platform == \'win32\'')
+    install_requires.append("pywin32 ; sys_platform == 'win32'")
 elif 'bdist_wheel' in sys.argv[1:]:
     raise RuntimeError('Error, you are trying to build certbot wheels using an old version '
                        'of setuptools. Version 36.2+ of setuptools is required.')