diff --git a/.travis.yml b/.travis.yml
index 9c867f237..8a2e8ce6f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,7 @@ python:
   - 3.3
 env:
     - TEST_SERVER_MODE=false
+    - TEST_SERVER_MODE=true
 install:
   - travis_retry pip install boto==2.45.0
   - travis_retry pip install boto3