diff --git a/.travis.yml b/.travis.yml
index b5adc2da7..36a956e95 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -27,13 +27,13 @@ matrix:
     - python: '3.6'
     - python: '3.6'
       dist: trusty
-    - python: '3.5'
-    - python: '3.5'
-      dist: trusty
       env: PYTHONOPTIMIZE=1
-    - python: '3.4'
+    - python: '3.5'
+    - python: '3.5'
       dist: trusty
       env: PYTHONOPTIMIZE=2
+    - python: '3.4'
+      dist: trusty
     - env: DOCKER="alpine" DOCKER_TAG="pytest"
     - env: DOCKER="arch" DOCKER_TAG="pytest" # contains PyQt5
     - env: DOCKER="ubuntu-trusty-x86" DOCKER_TAG="pytest"
diff --git a/.travis/install.sh b/.travis/install.sh
index f18aff079..b123fd302 100755
--- a/.travis/install.sh
+++ b/.travis/install.sh
@@ -7,7 +7,7 @@ sudo apt-get -qq install libfreetype6-dev liblcms2-dev python-tk\
 			 python-qt4 ghostscript libffi-dev libjpeg-turbo-progs cmake imagemagick\
              libharfbuzz-dev libfribidi-dev
 
-pip install cffi
+PYTHONOPTIMIZE=0 pip install cffi
 pip install check-manifest
 pip install coverage
 pip install olefile