diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 000000000..f7d3e237a
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+pycrypto==2.6.1
diff --git a/setup.py b/setup.py
index 560271fe3..8b0eeec31 100644
--- a/setup.py
+++ b/setup.py
@@ -18,6 +18,7 @@ setup(
     url='http://github.com/mjg59/python-broadlink',
     packages=find_packages(),
     scripts=[],
+    install_requires=['pycrypto==2.6.1'],
     description='Python API for controlling Broadlink IR controllers',
     classifiers=[
         'Development Status :: 4 - Beta',