diff --git a/.travis.yml b/.travis.yml
index 222d6d950..d17775c9d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,9 +11,9 @@ python:
 before_install:
   - wget https://github.com/mozilla/geckodriver/releases/download/v0.20.0/geckodriver-v0.20.0-linux64.tar.gz
   - mkdir geckodriver
-  - tar -xvf geckodriver-v0.20.0-linux64.tar.gz -C geckodriver
+  - tar -xf geckodriver-v0.20.0-linux64.tar.gz -C geckodriver
   - export PATH=$PATH:$PWD/geckodriver
-  - cd $TRAVIS_BUILD_DIR/emsdk; wget https://github.com/iodide-project/pyodide-demo/raw/toolchain/pyodide_toolchain.tgz; tar -xvf pyodide_toolchain.tgz; cd $TRAVIS_BUILD_DIR
+  - if [ ! -f emsdk/emsdk/emsdk ]; cd $TRAVIS_BUILD_DIR/emsdk; wget https://github.com/iodide-project/pyodide-demo/raw/toolchain/pyodide_toolchain.tgz; tar -xf pyodide_toolchain.tgz; cd $TRAVIS_BUILD_DIR; fi
 install:
   - pip install pytest selenium
 script: