diff --git a/.travis.yml b/.travis.yml
index 1d3c58ea..78169daa 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -31,4 +31,4 @@ script:
     # run all examples
     - cd ..
     - "echo 'backend : Agg' > matplotlibrc"
-    - for f in doc/examples/*.py; do python "$$f"; done
+    - for f in doc/examples/*.py; do $PYTHON "$f"; done