diff --git a/setup.py b/setup.py
index 0fbaa091b309b3aa5b32f5082c92ce7703728f06..8ece61d408ba0b29e536bc53fd7db8940dcc1527 100644
--- a/setup.py
+++ b/setup.py
@@ -68,4 +68,5 @@ setup(
     cmdclass    = {"build_ext": prepare_tinydtls},
     ext_modules = ext_modules,
     setup_requires = [ CYTHON_VERSION ],
+    install_requires = [ CYTHON_VERSION ],
     )