diff --git a/plugins/WebUi/__init__.py b/plugins/WebUi/__init__.py
index 607829f41..a4b3aa69e 100644
--- a/plugins/WebUi/__init__.py
+++ b/plugins/WebUi/__init__.py
@@ -230,10 +230,10 @@ class ConfigDialog(gtk.Dialog):
         self.download_dir.set_filename(self.config.get("download_dir"))
 
         if deluge.common.windows_check():
-            self.run_in_thread.set_active(False)
+            self.run_in_thread.set_active(True)
             self.run_in_thread.set_sensitive(False)
         else:
-            self.run_in_thread.set_active(True)
+            self.run_in_thread.set_active(False)
             self.run_in_thread.set_sensitive(False)
         self.cache_templates.set_active(self.config.get("cache_templates"))