diff --git a/src/osg/Texture.cpp b/src/osg/Texture.cpp
index 6b9cc819b..2a06fa6e3 100644
--- a/src/osg/Texture.cpp
+++ b/src/osg/Texture.cpp
@@ -1959,7 +1959,7 @@ void Texture::applyTexImage2D_load(State& state, GLenum target, const Image* ima
     {
         state.unbindPixelBufferObject();
 
-        BufferObject* bo = image->getBufferObject();
+        const BufferObject* bo = image->getBufferObject();
         if (bo->getCopyDataAndReleaseGLBufferObject())
         {
             //OSG_NOTICE<<"Release PBO"<<std::endl;