diff --git a/travis.osx.install.deps.sh b/travis.osx.install.deps.sh
index 9833b2c39a5..538db74d8fc 100755
--- a/travis.osx.install.deps.sh
+++ b/travis.osx.install.deps.sh
@@ -1,2 +1,4 @@
 brew install https://raw.github.com/Homebrew/homebrew-versions/master/autoconf213.rb
 brew install automake libtool pkg-config
+brew install python
+pip install virtualenv
diff --git a/travis.osx.script.sh b/travis.osx.script.sh
index 5058acb8d20..2fafa61bcf4 100755
--- a/travis.osx.script.sh
+++ b/travis.osx.script.sh
@@ -1,3 +1,4 @@
 cd build
 ../configure
 make tidy && make -j2 && make check-servo && make check-content && make check-ref-cpu
+WPTARGS="--processes=4" make check-wpt