diff --git a/setup.py b/setup.py
index 5cab668..f5cad92 100755
--- a/setup.py
+++ b/setup.py
@@ -24,7 +24,7 @@ setup(name='dmr_utils',
       keywords='dmr radio digital fec ecc mmdvm ham amateur radio',
       author='Cortney T. Buffington, N0MJS',
       author_email='n0mjs@me.com',
-      install_requires=['bitarray'],
+      install_requires=['bitarray','bitstring'],
       license='GPLv3',
       url='https://github.com/n0mjs710/dmr_utils',
       packages=['dmr_utils'],