diff --git a/PrinterApplication.py b/PrinterApplication.py
index 9c15d855f9..32ff26d2d4 100644
--- a/PrinterApplication.py
+++ b/PrinterApplication.py
@@ -63,8 +63,8 @@ class PrinterApplication(QtApplication):
         self._plugin_registry.loadPlugins({ "type": "mesh_reader" })
         self._plugin_registry.loadPlugins({ "type": "mesh_writer" })
         self._plugin_registry.loadPlugins({ "type": "tool" })
+        self._plugin_registry.loadPlugins({ "type": "extension" })
 
-        self._plugin_registry.loadPlugin('USBPrinting')
         self._plugin_registry.loadPlugin('CuraEngineBackend')
 
     def run(self):