diff --git a/.travis.yml b/.travis.yml
index d209f9622..7c7775518 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -243,7 +243,6 @@ addons:
   apt:
     packages:  # Keep in sync with letsencrypt-auto-source/pieces/bootstrappers/deb_common.sh and Boulder.
     - python-dev
-    - python3-dev
     - gcc
     - libaugeas0
     - libssl-dev