diff --git a/direct/src/plugin/p3dOsxSplashWindow.cxx b/direct/src/plugin/p3dOsxSplashWindow.cxx
index f0dcc3f197..207af6e700 100644
--- a/direct/src/plugin/p3dOsxSplashWindow.cxx
+++ b/direct/src/plugin/p3dOsxSplashWindow.cxx
@@ -30,6 +30,7 @@ P3DOsxSplashWindow(P3DInstance *inst) :
   _image = NULL;
   _image_data = NULL;
   _install_progress = 0;
+  _got_wparams = false;
 }
 
 ////////////////////////////////////////////////////////////////////
@@ -49,6 +50,19 @@ P3DOsxSplashWindow::
   }
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: P3DOsxSplashWindow::set_wparams
+//       Access: Public, Virtual
+//  Description: Changes the window parameters, e.g. to resize or
+//               reposition the window; or sets the parameters for the
+//               first time, creating the initial window.
+////////////////////////////////////////////////////////////////////
+void P3DOsxSplashWindow::
+set_wparams(const P3DWindowParams &wparams) {
+  P3DSplashWindow::set_wparams(wparams);
+  _got_wparams = true;
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: P3DOsxSplashWindow::set_image_filename
 //       Access: Public, Virtual
@@ -168,6 +182,10 @@ handle_event(P3D_event_data event) {
 ////////////////////////////////////////////////////////////////////
 void P3DOsxSplashWindow::
 paint_window() {
+  if (!_got_wparams) {
+    return;
+  }
+
   GrafPtr out_port = _wparams.get_parent_window()._port;
   GrafPtr portSave = NULL;
   Boolean portChanged = QDSwapPort(out_port, &portSave);
diff --git a/direct/src/plugin/p3dOsxSplashWindow.h b/direct/src/plugin/p3dOsxSplashWindow.h
index 66dec9d31b..33220ed916 100644
--- a/direct/src/plugin/p3dOsxSplashWindow.h
+++ b/direct/src/plugin/p3dOsxSplashWindow.h
@@ -33,6 +33,7 @@ public:
   P3DOsxSplashWindow(P3DInstance *inst);
   virtual ~P3DOsxSplashWindow();
 
+  virtual void set_wparams(const P3DWindowParams &wparams);
   virtual void set_image_filename(const string &image_filename,
                                   bool image_filename_temp);
   virtual void set_install_label(const string &install_label);
@@ -44,6 +45,7 @@ private:
   void paint_window();
 
 private:
+  bool _got_wparams;
   GWorldPtr _image;
   char *_image_data;
   int _image_height, _image_width;