diff --git a/daemon/logger/journald/read.go b/daemon/logger/journald/read.go
index 451a21b139..8c2b7db26a 100644
--- a/daemon/logger/journald/read.go
+++ b/daemon/logger/journald/read.go
@@ -404,6 +404,7 @@ func waitUntilFlushedImpl(s *journald) error {
 	go func() {
 		defer close(flushed)
 		runtime.LockOSThread()
+		defer runtime.UnlockOSThread()
 
 		var (
 			j   *sdjournal.Journal