diff --git a/.travis.yml b/.travis.yml
index f17403c..f5764f8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@ before_install:
   - sudo apt-get update -qq
 install:
   - sudo apt-get install -qq libpoppler-dev libfontforge-dev libspiro-dev libcairo-dev libfreetype6-dev
-  - wget 'https://github.com/coolwanglu/fontforge/archive/pdf2htmlEX.tar.gz' -O - | tar -zxf
+  - wget 'https://github.com/coolwanglu/fontforge/archive/pdf2htmlEX.tar.gz' -O - | tar -zxf -
   - pushd fontforge-pdf2htmlEX && ./autogen.sh && ./configure && make && sudo make install && popd
 before_script: 
   - cmake -DENABLE_SVG=ON .