diff --git a/support/travis-build.py b/support/travis-build.py
index 21416286..8fbf59c6 100755
--- a/support/travis-build.py
+++ b/support/travis-build.py
@@ -17,10 +17,10 @@ if build == 'Doc':
   travis = 'TRAVIS' in os.environ
   # Install dependencies.
   if travis:
-    check_call('curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -',
-               shell=True)
-    check_call("echo 'deb https://deb.nodesource.com/node_0.10 precise main' | " +
-               "sudo tee /etc/apt/sources.list.d/nodesource.list", shell=True)
+    check_call('curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | ' +
+               'sudo apt-key add -', shell=True)
+    check_call('echo "deb https://deb.nodesource.com/node_0.10 precise main" | ' +
+               'sudo tee /etc/apt/sources.list.d/nodesource.list', shell=True)
     check_call(['sudo', 'apt-get', 'update'])
     check_call(['sudo', 'apt-get', 'install', 'python-virtualenv', 'doxygen', 'nodejs'])
     check_call(['npm', 'install', '-g', 'less'])