Getting the bcrypt warning on server (1.5.1)

I can see the following warning in my server logs:

Note: you are using a pure-JavaScript implementation of bcrypt.
While this implementation will work correctly, it is known to be
approximately three times slower than the native implementation.
In order to use the native implementation instead, run

  meteor npm install --save bcrypt

in the root directory of your application.

I delpoy fromwindows 7 to ubuntu 14.4 using meteor build .build --architecture os.linux.x86_64.
I got the bcrypt warning on my local machine too until I run the suggested command. But how can I fix this on server? I tried to install bcrypt globally and I also to add it in the app/programs/server directory.