diff --git a/test/utils/shippable/timing.py b/test/utils/shippable/timing.py
index bc170f16c9d..f27fdbb4866 100755
--- a/test/utils/shippable/timing.py
+++ b/test/utils/shippable/timing.py
@@ -8,3 +8,4 @@ start = time.time()
 for line in sys.stdin:
     seconds = time.time() - start
     sys.stdout.write('%02d:%02d %s' % (seconds // 60, seconds % 60, line))
+    sys.stdout.flush()