diff --git a/src/osgParticle/PrecipitationEffect.cpp b/src/osgParticle/PrecipitationEffect.cpp
index 9342630c6..b18ff92a7 100644
--- a/src/osgParticle/PrecipitationEffect.cpp
+++ b/src/osgParticle/PrecipitationEffect.cpp
@@ -861,7 +861,7 @@ PrecipitationEffect::PrecipitationDrawable::PrecipitationDrawable():
 }
 
 PrecipitationEffect::PrecipitationDrawable::PrecipitationDrawable(const PrecipitationDrawable& copy, const osg::CopyOp& copyop):
-    Drawable(copy,copyop),
+    osg::Drawable(copy,copyop),
     _requiresPreviousMatrix(copy._requiresPreviousMatrix),
     _geometry(copy._geometry),
     _drawType(copy._drawType),
diff --git a/src/osgPlugins/OpenFlight/Pools.h b/src/osgPlugins/OpenFlight/Pools.h
index 7d153bdba..f6ccaa0cb 100644
--- a/src/osgPlugins/OpenFlight/Pools.h
+++ b/src/osgPlugins/OpenFlight/Pools.h
@@ -218,7 +218,7 @@ public:
         TexturePool* texture,
         LightPointAppearancePool* lpAppearance,
         ShaderPool* shader )
-      : Referenced(),
+      : osg::Referenced(),
         _colorPool( color ),
         _materialPool( material ),
         _texturePool( texture ),
diff --git a/src/osgSim/OpenFlightOptimizer.cpp b/src/osgSim/OpenFlightOptimizer.cpp
index 0c3a0cbcb..ad714edd7 100644
--- a/src/osgSim/OpenFlightOptimizer.cpp
+++ b/src/osgSim/OpenFlightOptimizer.cpp
@@ -155,7 +155,7 @@ class GeodeStateOptimizer : public osgUtil::Optimizer::StateVisitor
                 }
             }
 
-            StateVisitor::optimize();
+            osgUtil::Optimizer::StateVisitor::optimize();
         }