diff --git a/setup.py b/setup.py
index 64e94f1..8144eca 100755
--- a/setup.py
+++ b/setup.py
@@ -22,7 +22,7 @@ setup(
     package_dir={"twisted": "daphne/twisted"},
     packages=find_packages() + ["twisted.plugins"],
     include_package_data=True,
-    install_requires=["twisted>=18.7", "autobahn>=0.18", "asgiref~=3.0"],
+    install_requires=["twisted[tls]>=18.7", "autobahn>=0.18", "asgiref~=3.0"],
     setup_requires=["pytest-runner"],
     extras_require={
         "tests": ["hypothesis~=3.88", "pytest~=3.10", "pytest-asyncio~=0.8"]