diff --git a/tox.ini b/tox.ini
index 22964b2a1..4534d10d8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,6 +23,7 @@ passenv = TAHOE_LAFS_* USERPROFILE HOMEDRIVE HOMEPATH
 deps =
      certifi
      python-subunit
+     subunitreporter
 # We add usedevelop=True for speed, and extras=test to get things like "mock"
 # that are required for our unit tests.
 usedevelop = True