diff --git a/setup.py b/setup.py
index 55d846402440f7c3c31f88f0fa2ac53a3034f958..cb9052716cf84e7988bcb22037906d8ec627a2ee 100755
--- a/setup.py
+++ b/setup.py
@@ -12,7 +12,7 @@ setup(
     license = "MIT",
     packages = find_packages(),
     platforms = ["any"],
-    install_requires = ["Flask", "itsdangerous"],
+    install_requires = ["pyOpenSSL", "Flask", "itsdangerous"],
     zip_safe = False,
     entry_points = {
         "console_scripts": [