diff --git a/extern/osgQt/osgQOpenGLWidget.cpp b/extern/osgQt/osgQOpenGLWidget.cpp
index 0f2fba71cc..d52f3c02ac 100644
--- a/extern/osgQt/osgQOpenGLWidget.cpp
+++ b/extern/osgQt/osgQOpenGLWidget.cpp
@@ -41,8 +41,6 @@ std::mutex* osgQOpenGLWidget::mutex()
 
 void osgQOpenGLWidget::initializeGL()
 {
-    // Initializes OpenGL function resolution for the current context.
-    initializeOpenGLFunctions();
     createRenderer();
     emit initialized();
 }
diff --git a/extern/osgQt/osgQOpenGLWidget.hpp b/extern/osgQt/osgQOpenGLWidget.hpp
index 07ffc12248..8677b146f8 100644
--- a/extern/osgQt/osgQOpenGLWidget.hpp
+++ b/extern/osgQt/osgQOpenGLWidget.hpp
@@ -10,7 +10,6 @@
 #include <osg/ArgumentParser>
 
 #include <QOpenGLWidget>
-#include <QOpenGLFunctions>
 #include <QReadWriteLock>
 
 class CompositeOsgRenderer;
@@ -21,8 +20,7 @@ namespace osgViewer
     class GraphicsWindowEmbedded;
 }
 
-class osgQOpenGLWidget : public QOpenGLWidget,
-    protected QOpenGLFunctions
+class osgQOpenGLWidget : public QOpenGLWidget
 {
     Q_OBJECT