diff --git a/bindep.txt b/bindep.txt
index c587dda..efc5441 100644
--- a/bindep.txt
+++ b/bindep.txt
@@ -1,5 +1,5 @@
 # This is a cross-platform list tracking distribution packages needed by tests;
 # see http://docs.openstack.org/infra/bindep/ for additional information.
 
-pypy
-pypy-dev
+pypy [test]
+pypy-dev [test]
diff --git a/tox.ini b/tox.ini
index 26cfb11..84806cc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -56,3 +56,12 @@ commands=
 ignore = H101,H301,H306,H401,H403,H404,H405
 show-source = True
 exclude = .venv,.tox,dist,doc,*egg
+
+[testenv:bindep]
+# Do not install any requirements. We want this to be fast and work even if
+# system dependencies are missing, since it's used to tell you what system
+# dependencies are missing! This also means that bindep must be installed
+# separately, outside of the requirements files.
+usedevelop = False
+deps = bindep
+commands = bindep test