diff --git a/scripts/travis_before_install.sh b/scripts/travis_before_install.sh
index f93bb15c5..0a01cbcd9 100755
--- a/scripts/travis_before_install.sh
+++ b/scripts/travis_before_install.sh
@@ -32,8 +32,9 @@ if [[ ${TRAVIS_OS_NAME} == "linux" ]]; then
                             llvm-3.4 # required for mesa
 
 
+    unset MASON_PLATFORM
     mapbox_time "install_mesa" \
-    MASON_PLATFORM= mason install mesa 10.3.1
+    mason install mesa 10.3.1
 
     mapbox_time "install_awscli" \
     sudo pip install awscli