diff --git a/examples/OpenGLWindow/X11OpenGLWindow.cpp b/examples/OpenGLWindow/X11OpenGLWindow.cpp
index 01a07d132..681c3f423 100644
--- a/examples/OpenGLWindow/X11OpenGLWindow.cpp
+++ b/examples/OpenGLWindow/X11OpenGLWindow.cpp
@@ -172,6 +172,8 @@ struct InternalData2
     XEvent                  m_xev;
     GLXFBConfig             m_bestFbc;
     int			    m_modifierFlags;
+    int			    m_glWidth;
+    int			    m_glHeight;
 
 #ifdef DYNAMIC_LOAD_X11_FUNCTIONS
 	//dynamically load stuff
@@ -207,6 +209,9 @@ struct InternalData2
 	InternalData2()
 	:m_dpy(0),
 	m_vi(0),
+	m_modifierFlags(0),
+	m_glWidth(-1),
+	m_glHeight(-1),
 	m_wheelCallback(0),
 	m_mouseMoveCallback(0),
 	m_mouseButtonCallback(0),
@@ -929,6 +934,9 @@ void X11OpenGLWindow::pumpMessage()
             {
   //              printf("@");
   //              fflush(0);
+		m_data->m_glWidth = m_data->m_xev.xconfigure.width;
+		m_data->m_glHeight = m_data->m_xev.xconfigure.height;
+
                 if (m_data->m_resizeCallback)
                 {
                     (*m_data->m_resizeCallback)(m_data->m_xev.xconfigure.width,m_data->m_xev.xconfigure.height);
@@ -1031,6 +1039,10 @@ void X11OpenGLWindow::setMouseButtonCallback(b3MouseButtonCallback	mouseCallback
 
 void X11OpenGLWindow::setResizeCallback(b3ResizeCallback	resizeCallback)
 {
+	if (resizeCallback && m_data->m_glWidth>0 && m_data->m_glHeight > 0)
+	{
+		resizeCallback(m_data->m_glWidth, m_data->m_glHeight);
+	}
 	m_data->m_resizeCallback = resizeCallback;
 }