diff --git a/include/osg/GLExtensions b/include/osg/GLExtensions
index ee6d00b5f..ff0bb3ba8 100644
--- a/include/osg/GLExtensions
+++ b/include/osg/GLExtensions
@@ -315,6 +315,8 @@ class OSG_EXPORT GLExtensions : public osg::Referenced
         bool isBufferObjectSupported;
         bool isPBOSupported;
         bool isTBOSupported;
+        bool isVAOSupported;
+        bool isTransformFeedbackSupported;
 
         void (GL_APIENTRY * glGenBuffers) (GLsizei n, GLuint *buffers);
         void (GL_APIENTRY * glBindBuffer) (GLenum target, GLuint buffer);
diff --git a/src/osg/GLExtensions.cpp b/src/osg/GLExtensions.cpp
index d5bc9de44..fa1c365af 100644
--- a/src/osg/GLExtensions.cpp
+++ b/src/osg/GLExtensions.cpp
@@ -680,7 +680,8 @@ GLExtensions::GLExtensions(unsigned int contextID)
     isPBOSupported = OSG_GL3_FEATURES || osg::isGLExtensionSupported(contextID,"GL_ARB_pixel_buffer_object");
     isUniformBufferObjectSupported = osg::isGLExtensionSupported(contextID, "GL_ARB_uniform_buffer_object");
     isTBOSupported = osg::isGLExtensionSupported(contextID,"GL_ARB_texture_buffer_object");
-
+    isVAOSupported = osg::isGLExtensionSupported(contextID, "GL_ARB_vertex_array_object");
+    isTransformFeedbackSupported = osg::isGLExtensionSupported(contextID, "GL_ARB_transform_feedback2");
 
     // BlendFunc extensions
     isBlendFuncSeparateSupported = OSG_GLES2_FEATURES || OSG_GL3_FEATURES ||