TeamCity runs ignored NUnit test case

Test case that were failing in debug was set to be ignored in debug. TeamCity still runs the test. The test is properly ignored in debug on my local machine. 

Some other tests that are ignored for both release and debug configurations are ignored as expected. 

        [Test]
        [Category("IntegrationTestLongRunning")]
        [Category("Algorithm")]
#if DEBUG
         [Ignore("Too slow in debug.")]
#endif
        public void UnitTest()
        {
            // Some test code...
        }