diff --git a/.travis.yml b/.travis.yml
index 7a681043..df835f7e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,7 +12,7 @@ env:
 before_install:
   - gem update --system
   - gem install bundler
-  - ./$TRAVIS_BUILD_DIR/scripts/install-doxygen.sh
+  - . $TRAVIS_BUILD_DIR/scripts/install-doxygen.sh
 
 # Install dependencies
 addons: