diff --git a/.travis.yml b/.travis.yml
index 13f93387..31a19e67 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -26,8 +26,8 @@ before_install:
     # and the minimum version of cython and networkx
     -  if [[  $TRAVIS_PYTHON_VERSION == 2.7* ]]; then
             travis_retry sudo apt-get install python-scipy python-matplotlib;
-            pip install https://github.com/cython/cython/archive/0.19.2.tar.gz
-            pip install https://github.com/networkx/networkx/archive/networkx-1.6.tar.gz
+            pip install https://github.com/cython/cython/archive/0.19.2.tar.gz;
+            pip install https://github.com/networkx/networkx/archive/networkx-1.6.tar.gz;
        fi
 
     - travis_retry pip install  -r requirements.txt $WHEELHOUSE;