diff --git a/direct/src/plugin_standalone/panda3d.h b/direct/src/plugin_standalone/panda3d.h
index 15340f3013..d92dc8db4d 100755
--- a/direct/src/plugin_standalone/panda3d.h
+++ b/direct/src/plugin_standalone/panda3d.h
@@ -28,7 +28,7 @@
 // Description : A standalone program that invokes the Panda3D plugin
 //               to launch .p3d files.
 ////////////////////////////////////////////////////////////////////
-class Panda3D : private Panda3DBase {
+class Panda3D : public Panda3DBase {
 public:
   Panda3D(bool console_environment);
 
diff --git a/direct/src/plugin_standalone/panda3dBase.cxx b/direct/src/plugin_standalone/panda3dBase.cxx
index af5d883e4a..4f1826c98c 100644
--- a/direct/src/plugin_standalone/panda3dBase.cxx
+++ b/direct/src/plugin_standalone/panda3dBase.cxx
@@ -577,7 +577,7 @@ report_download_complete(P3D_instance *instance) {
 ////////////////////////////////////////////////////////////////////
 pascal void Panda3DBase::
 st_timer_callback(EventLoopTimerRef timer, void *user_data) {
-  ((Panda3D *)user_data)->timer_callback(timer);
+  ((Panda3DBase *)user_data)->timer_callback(timer);
 }
 #endif  // __APPLE__