diff --git a/tests/letstest/multitester.py b/tests/letstest/multitester.py
index bc6e19ffb..5779b4d05 100644
--- a/tests/letstest/multitester.py
+++ b/tests/letstest/multitester.py
@@ -553,11 +553,13 @@ def main():
         for i in range(num_processes):
             inqueue.put(SENTINEL)
         print('Waiting on client processes', end='')
+        sys.stdout.flush()
         for p in jobs:
             while p.is_alive():
                 p.join(5 * 60)
                 # Regularly print output to keep Travis happy
                 print('.', end='')
+                sys.stdout.flush()
         print()
         # add SENTINEL to output queue
         outqueue.put(SENTINEL)