diff --git a/main/src/main/scala/sbt/internal/server/NetworkChannel.scala b/main/src/main/scala/sbt/internal/server/NetworkChannel.scala
index 5168b55bf..7df83c092 100644
--- a/main/src/main/scala/sbt/internal/server/NetworkChannel.scala
+++ b/main/src/main/scala/sbt/internal/server/NetworkChannel.scala
@@ -565,6 +565,7 @@ final class NetworkChannel(
       logShutdown: Boolean,
       remainingCommands: Option[(String, String)]
   ): Unit = {
+    doFlush()
     terminal.close()
     StandardMain.exchange.removeChannel(this)
     super.shutdown(logShutdown)