diff --git a/plugins/synced_folders/rsync/command/rsync_auto.rb b/plugins/synced_folders/rsync/command/rsync_auto.rb
index 8bb658c5d..c18c600f3 100644
--- a/plugins/synced_folders/rsync/command/rsync_auto.rb
+++ b/plugins/synced_folders/rsync/command/rsync_auto.rb
@@ -114,7 +114,7 @@ module VagrantPlugins
           callback = lambda do
             # This needs to execute in another thread because Thread
             # synchronization can't happen in a trap context.
-            Thread.new { queue << true }.join
+            Thread.new { queue << true }
           end
 
           # Run the listener in a busy block so that we can cleanly