How can I prevent hostname from changing?

When I boot up one of our computers it gets a static DHCP address which is specified in our DNS as client1.domain.com and so on. The hostname sets automatically from reverse DNS at bootup and everything work fine. But after a while I see that the computer changes hostname to Users-MacBook-Pro.local.

Our system depends on that the computers have a static hostname so I want to prevent the computer to change it by itself. It works if I manually set it using 'scutil' but I would just like to "lock" hostname to the one it is getting from the DNS.

Is there any way so accomplish that?

We are using OS X 10.9.5