diff --git a/master.cfg b/master.cfg
index 6da108e..7a692b9 100644
--- a/master.cfg
+++ b/master.cfg
@@ -1093,6 +1093,9 @@ The parameters of the class are:
                 self.extra_make_check_flags.append (util.Interpolate ("-j%(prop:jobs)s"))
                 self.extra_make_check_flags.append (r'FORCE_PARALLEL=1')
 
+            # Enable timestamp'ed output
+            self.extra_make_check_flags.append ('TS=1')
+
             self.addStep (self.TestClass (self.make_command, self.extra_make_check_flags,
                                           self.test_env,
                                           doStepIf = scheduler_is_not_racy_do,