diff --git a/src/osgVolume/MultipassTechnique.cpp b/src/osgVolume/MultipassTechnique.cpp
index e2f97da37..30a238216 100644
--- a/src/osgVolume/MultipassTechnique.cpp
+++ b/src/osgVolume/MultipassTechnique.cpp
@@ -161,7 +161,7 @@ class RTTCameraCullCallback : public osg::NodeCallback
             _tileData(tileData),
             _mt(mt) {}
 
-        virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
+        virtual void operator()(osg::Node* /*node*/, osg::NodeVisitor* nv)
         {
             osgUtil::CullVisitor* cv = nv->asCullVisitor();
 
@@ -935,7 +935,7 @@ class RTTBackfaceCameraCullCallback : public osg::NodeCallback
             _tileData(tileData),
             _mt(mt) {}
 
-        virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
+        virtual void operator()(osg::Node* /*node*/, osg::NodeVisitor* nv)
         {
             osgUtil::CullVisitor* cv = nv->asCullVisitor();
 
@@ -963,10 +963,10 @@ class ShadingModelVisitor : public osgVolume::PropertyVisitor
             _shadingModel(VolumeSettings::Standard),
             _usesTransferFunction(false) {}
 
-        virtual void apply(IsoSurfaceProperty& iso) { _shadingModel = VolumeSettings::Isosurface; }
-        virtual void apply(MaximumIntensityProjectionProperty& mip) { _shadingModel = VolumeSettings::MaximumIntensityProjection; }
-        virtual void apply(LightingProperty& lp) { _shadingModel = VolumeSettings::Light; }
-        virtual void apply(TransferFunctionProperty& tf) { _usesTransferFunction = true; }
+        virtual void apply(IsoSurfaceProperty& /*iso*/) { _shadingModel = VolumeSettings::Isosurface; }
+        virtual void apply(MaximumIntensityProjectionProperty& /*mip*/) { _shadingModel = VolumeSettings::MaximumIntensityProjection; }
+        virtual void apply(LightingProperty& /*lp*/) { _shadingModel = VolumeSettings::Light; }
+        virtual void apply(TransferFunctionProperty& /*tf*/) { _usesTransferFunction = true; }
         virtual void apply(VolumeSettings& vs) { _shadingModel = vs.getShadingModel(); }
 
         VolumeSettings::ShadingModel    _shadingModel;
diff --git a/src/osgVolume/VolumeScene.cpp b/src/osgVolume/VolumeScene.cpp
index 56133b798..b04684743 100644
--- a/src/osgVolume/VolumeScene.cpp
+++ b/src/osgVolume/VolumeScene.cpp
@@ -67,7 +67,7 @@ void VolumeScene::ViewData::clearTiles()
     }
 }
 
-void VolumeScene::ViewData::visitTile(VolumeTile* tile)
+void VolumeScene::ViewData::visitTile(VolumeTile* /*tile*/)
 {
 }