diff --git a/tests/SMPClient.hs b/tests/SMPClient.hs
index 69e670b06..7eb49fc38 100644
--- a/tests/SMPClient.hs
+++ b/tests/SMPClient.hs
@@ -37,6 +37,7 @@ import Simplex.Messaging.Version
 import Simplex.Messaging.Version.Internal
 import System.Environment (lookupEnv)
 import System.Info (os)
+import System.Process (callCommand)
 import Test.Hspec hiding (fit, it)
 import UnliftIO.Concurrent
 import qualified UnliftIO.Exception as E
@@ -302,7 +303,7 @@ serverBracket process afterProcess f = do
   started <- newEmptyTMVarIO
   E.bracket
     (forkIOWithUnmask (\unmask -> unmask (process started) `E.catchAny` handleStartError started))
-    (\t -> killThread t >> afterProcess >> waitFor started "stop")
+    (\t -> killThread t >> afterProcess >> waitFor started "stop" >> callCommand "sync")
     (\t -> waitFor started "start" >> f t >>= \r -> r <$ threadDelay 100000)
   where
     -- it putTMVar is called twise to unlock both parts of the bracket in case of start failure