XCode Project - additional command line parameters

Hello everyone,
I just downloaded and started up TeamCity. It seems I am unable to build and test a simple iOS project.

I created an XCode runner, scheme based and checked run tests. This fails due to a missing parameters I'd like to pass to the xcodebuild command.

Right now the logs show the following invocation:

Starting: /Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild -workspace Testproject.xcodeproj/project.xcworkspace -scheme Testproject clean build test

How can I pass in something in there? I can see in https://confluence.jetbrains.com/display/TCD9/Xcode+Project#XcodeProject-Xcode7Support that there should be an option for "Additional command line parameters" but I cannot find that on the runner's form. Running TeamCity 9.1.5 (build 37377).

Thanks in advance,
Nicky