diff --git a/.gitignore b/.gitignore
index 9f1572c0d..eeb581afd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,6 +17,7 @@
 /.built
 /src/allmydata_tahoe.egg-info/
 Twisted-*.egg
+zope.interface-*.egg
 
 /_trial_temp*
 /tmp*