diff --git a/.travis.yml b/.travis.yml
index 028ce22f3..ac97dc6b5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -103,6 +103,9 @@ matrix:
     - compiler: gcc
       os: linux
       env: SWIGLANG=python SWIG_FEATURES=-builtin PY3=3 VER=3.5
+    - compiler: gcc
+      os: linux
+      env: SWIGLANG=python SWIG_FEATURES=-builtin PY3=3 VER=3.5 SWIGOPTPY3=
     - compiler: gcc
       os: linux
       env: SWIGLANG=python SWIG_FEATURES=-O