diff --git a/rackspace.ini b/rackspace.ini
index c3f5696..098ccaf 100644
--- a/rackspace.ini
+++ b/rackspace.ini
@@ -205,7 +205,7 @@ targets = py27_32 py27_64
 package = zope.security
 minVersion =
 maxVersion =
-excludeVersions = 3.4.0b5
+excludeVersions = 3.4.0b5 3.8.4
 targets = py24_32 py25_32 py26_32 py26_64
 
 [zope.security_27]