diff --git a/.travis.yml b/.travis.yml
index d522dab..dbd779e 100755
--- a/.travis.yml
+++ b/.travis.yml
@@ -55,7 +55,7 @@ install:
   - npm install
   # build from source, run test and generate code coverage
   - make cover
-  - DEBUG=true node lib/opencv.js
+  - NODE_OPENCV_DEBUG=true node lib/opencv.js
   - docker build -t peterbraden/node-opencv-ubuntu-12-04 -f test/Dockerfile-ubuntu-12-04 .
   - docker build -t peterbraden/node-opencv-ubuntu-14-04 -f test/Dockerfile-ubuntu-14-04 .