diff --git a/setup.py b/setup.py
index 2236310c..45497c5e 100755
--- a/setup.py
+++ b/setup.py
@@ -102,6 +102,9 @@ setuptools.setup(
     packages=['osc', 'osc.util'],
     data_files=data_files,
     install_requires=['cryptography', 'urllib3'],
+    extras_require={
+       'RPM signature verification': ['rpm'],
+    },
     entry_points={
       'console_scripts': [
           'osc=osc.babysitter:main'