diff --git a/.travis.yml b/.travis.yml
index fe01df47e..ce15e294b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -45,7 +45,7 @@ matrix:
     - compiler: gcc
       env: SWIGLANG=python SWIG_FEATURES=-builtin
     - compiler: gcc
-      env: SWIGLANG=python SWIG_FEATURES=-builtin PY3=1
+      env: SWIGLANG=python SWIG_FEATURES=-builtin PY3=3
     - compiler: gcc
       env: SWIGLANG=ruby
     - compiler: gcc