diff --git a/etc/requirements.txt b/etc/requirements.txt
index cdfe7dd4..c09ae09b 100644
--- a/etc/requirements.txt
+++ b/etc/requirements.txt
@@ -1,5 +1,7 @@
 # Incompatible with earlier PIP versions
 pip>=7.1.0
+# bcolz fails to install if this is not in the build_requires.
+setuptools>18.0
 
 # Logging
 Logbook==0.12.5