diff --git a/tools/testing/ktest/ktest.pl b/tools/testing/ktest/ktest.pl
index 7301d03..0603e64 100755
--- a/tools/testing/ktest/ktest.pl
+++ b/tools/testing/ktest/ktest.pl
@@ -838,6 +838,7 @@
 
 	if ($stop_test_after > 0 && !$booted && !$bug) {
 	    if (time - $monitor_start > $stop_test_after) {
+		doprint "STOP_TEST_AFTER ($stop_test_after seconds) timed out\n";
 		$done = 1;
 	    }
 	}