diff --git a/src/kits/app/Looper.cpp b/src/kits/app/Looper.cpp
index fca7112e61..3c7ffec15f 100644
--- a/src/kits/app/Looper.cpp
+++ b/src/kits/app/Looper.cpp
@@ -829,6 +829,7 @@ BLooper::_PostMessage(BMessage *msg, BHandler *handler,
 
 	status_t status;
 	BMessenger messenger(handler, this, &status);
+	listLocker.Unlock();
 	if (status == B_OK)
 		status = messenger.SendMessage(msg, replyTo, 0);