diff --git a/src/GUI/CanvasWidget.cxx b/src/GUI/CanvasWidget.cxx
index 56fe05a7b..74b929b59 100644
--- a/src/GUI/CanvasWidget.cxx
+++ b/src/GUI/CanvasWidget.cxx
@@ -26,6 +26,8 @@
 #include <Main/fg_os.hxx>      // fgGetKeyModifiers()
 #include <Scripting/NasalSys.hxx>
 
+#include <osg/GLExtensions>
+
 #include <simgear/canvas/Canvas.hxx>
 #include <simgear/canvas/events/MouseEvent.hxx>
 
@@ -196,9 +198,10 @@ void CanvasWidget::setSize(int w, int h)
 //------------------------------------------------------------------------------
 void CanvasWidget::draw(int dx, int dy)
 {
+  osg::GLExtensions* extensions = osg::GLExtensions::Get(0, true);
   glEnable(GL_TEXTURE_2D);
- // glEnable(GL_BLEND);
- // glBlendFuncSeparate(GL_ONE, GL_ZERO, GL_ZERO, GL_ONE);
+  glEnable(GL_BLEND);
+  extensions->glBlendFuncSeparate(GL_ONE, GL_ZERO, GL_ZERO, GL_ONE);
     
   glBindTexture(GL_TEXTURE_2D, _canvas_mgr->getCanvasTexId(_canvas));
   glBegin( GL_QUADS );
@@ -209,5 +212,5 @@ void CanvasWidget::draw(int dx, int dy)
     glTexCoord2f(0,1); glVertex2f(dx + abox.min[0], dy + abox.max[1]);
   glEnd();
   glDisable(GL_TEXTURE_2D);
- // glDisable(GL_BLEND);
+  glDisable(GL_BLEND);
 }