diff --git a/test/plugin/test_output_as_buffered_secondary.rb b/test/plugin/test_output_as_buffered_secondary.rb
index cdf16bce17..39ab06cc22 100644
--- a/test/plugin/test_output_as_buffered_secondary.rb
+++ b/test/plugin/test_output_as_buffered_secondary.rb
@@ -617,7 +617,7 @@ def dummy_event_stream
       assert{ !chunks[1].empty? }
 
       30.times do |i| # large enough
-        now = first_failure + 60 * 0.8 + 2 + [i, 10].min # must be less than retry_timeout
+        now = first_failure + 60 * 0.8 + 2 + [i, 9].min # must be less than retry_timeout
         Timecop.freeze( now )
         @i.flush_thread_wakeup