diff --git a/.travis.yml b/.travis.yml
index 9530a27f8bb..14da7f5ffcb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,7 +23,6 @@ python:
 
 # command to install dependencies
 before_install:
-  - chmod +x ./.travis/travis_before_install.sh
   - ./.travis/travis_before_install.sh
   - export PATH=/home/travis/miniconda2/bin:$PATH
 
@@ -35,7 +34,6 @@ addons:
    - dvipng
 
 install:
-  - chmod +x ./.travis/travis_install.sh
   - ./.travis/travis_install.sh
   - source activate pyenv
   - if [[ $TRAVIS_PYTHON_VERSION == '2.7' ]]; then pip install pydot; else pip install pydot-ng; fi
diff --git a/.travis/travis_before_install.sh b/.travis/travis_before_install.sh
old mode 100644
new mode 100755
diff --git a/.travis/travis_install.sh b/.travis/travis_install.sh
old mode 100644
new mode 100755