diff --git a/src-hxbrief/Main.hs b/src-hxbrief/Main.hs
index 4117a4e..513dbd9 100644
--- a/src-hxbrief/Main.hs
+++ b/src-hxbrief/Main.hs
@@ -853,6 +853,8 @@ main = B.mainFromCmdParser $ do
         let mainBlock =
               P.withCreateProcess ((P.proc restPath restArgs) { P.std_in = P.CreatePipe, P.std_out = P.CreatePipe, P.std_err = P.CreatePipe, P.env = Just innerEnv })
                 $ \(Just inp) (Just out) (Just err) hdl -> do
+                    System.IO.hSetBuffering out System.IO.LineBuffering
+                    System.IO.hSetBuffering err System.IO.LineBuffering
                     A.withAsync (inHandler inp) $ \inAsync -> A.withAsync (outHandler out) $ \outAsync -> A.withAsync (errHandler err) $ \errAsync ->
                       A.withAsync tickHandler $ \_tickAsync -> do
                         ec <- P.waitForProcess hdl