diff --git a/_travis/prepare_osx.sh b/_travis/prepare_osx.sh
index db750bb9ead0124f604bb09c80122e674afb0c2c..99b2327d08a28c72f13b811abe3348bac71e5b03 100755
--- a/_travis/prepare_osx.sh
+++ b/_travis/prepare_osx.sh
@@ -19,3 +19,4 @@
 
 set -o nounset                              # Treat unset variables as an error
 echo "Nothing to do here. The moose.rb formula will install all dependecnies"
+brew tap homebrew/science