diff --git a/setup.py b/setup.py
index 048fa03..264c200 100644
--- a/setup.py
+++ b/setup.py
@@ -12,7 +12,7 @@
     author_email='dan-isobar@erase.net',
     url='https://github.com/ideoforms/isobar',
     packages=find_packages(),
-    install_requires=['python-osc', 'mido', 'python-rtmidi', 'LinkPython-extern'],
+    install_requires=['python-osc', 'mido', 'python-rtmidi', 'LinkPython-extern', 'numpy'],
     keywords=['sound', 'music', 'composition'],
     classifiers=[
         'Topic :: Multimedia :: Sound/Audio',