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-rw-r--r--t/async-response.ru1
1 files changed, 0 insertions, 1 deletions
diff --git a/t/async-response.ru b/t/async-response.ru
index ef76504..b45f1b2 100644
--- a/t/async-response.ru
+++ b/t/async-response.ru
@@ -2,7 +2,6 @@ use Rack::Chunked
 use Rainbows::DevFdResponse
 run lambda { |env|
   io = IO.popen('for i in 0 1 2 3 4 5 6 7 8 9; do date; sleep 1; done', 'rb')
-  io.sync = true
   [
     200,
     {