How to mske TeamCity trigger a build only for PRs to master branch?

I've configured build with the following branch specification:

-:<default> +:refs/pull/*/merge

But such specification makes TC to trigger build for any PR, though I need this only for PRs to master.

Is it possible to achieve?

Solution

If my understanding of what you wish to achieve is correct, then unfortunately it is not possible at the moment. There has been a feature request for this in YouTrack for quite some time.

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