diff --git a/panda/src/gui/guiManager.h b/panda/src/gui/guiManager.h
index eabc8d2a42..005b46bfd6 100644
--- a/panda/src/gui/guiManager.h
+++ b/panda/src/gui/guiManager.h
@@ -32,8 +32,7 @@ private:
   INLINE GuiManager(MouseWatcher*, Node*);
 
 PUBLISHED:
-  static GuiManager* get_ptr(GraphicsWindow*, MouseAndKeyboard*,
-			     Node *root2d = (Node *)NULL);
+  static GuiManager* get_ptr(GraphicsWindow*, MouseAndKeyboard*, Node *root2d);
 
   void add_region(GuiRegion*);
   void add_label(GuiLabel*);