Meteor method called from client not running on server

I’m upgrading from Meteor 1.0 to Meteor 1.2.
The following Meteor method under 1.0 would run on both client and server. This was evidenced by the log under Meteor.isServer. However, under 1.2 it only runs on client and Meteor.isServer is always false.
Any insights/suggestions are appreciated.

In /lib/collections/

   myFunction : ->
      if Meteor.isServer
          console.log 'isServer'
          {do stuff}

Note: I have tried upgrading to 1.2.1, and 1.3 but with no better luck.