diff --git a/qgis2threejs.py b/qgis2threejs.py
index ccd3c441..9efb0f27 100644
--- a/qgis2threejs.py
+++ b/qgis2threejs.py
@@ -124,6 +124,7 @@ def setting(self):
     dialog = SettingsDialog(self.iface.mainWindow())
     dialog.show()
     if dialog.exec_():
+      from pluginmanager import PluginManager
       self.pluginManager = PluginManager()
 
   def loadExportSettings(self, filename):