diff --git a/include/osg/GLObjects b/include/osg/GLObjects
index 2a50e8593..84b5ec308 100644
--- a/include/osg/GLObjects
+++ b/include/osg/GLObjects
@@ -61,11 +61,11 @@ class OSG_EXPORT GraphicsObjectManager : public osg::Referenced
         unsigned int getContextID() const { return _contextID; }
 
         /** Signal that a new frame has started.*/
-        virtual void newFrame(osg::FrameStamp* fs) {}
+        virtual void newFrame(osg::FrameStamp* /*fs*/) {}
 
         virtual void resetStats() {}
-        virtual void reportStats(std::ostream& out)  {}
-        virtual void recomputeStats(std::ostream& out) const  {}
+        virtual void reportStats(std::ostream& /*out*/)  {}
+        virtual void recomputeStats(std::ostream& /*out*/) const  {}
 
 
         /** Flush all deleted OpenGL objects within the specified availableTime.
diff --git a/include/osgShadow/ViewDependentShadowTechnique b/include/osgShadow/ViewDependentShadowTechnique
index a7a875dfc..8b35683c1 100644
--- a/include/osgShadow/ViewDependentShadowTechnique
+++ b/include/osgShadow/ViewDependentShadowTechnique
@@ -206,7 +206,7 @@ protected:
             */
             osg::observer_ptr< ViewDependentShadowTechnique > _st;
 
-            virtual void resizeGLObjectBuffers(unsigned int maxSize) {}
+            virtual void resizeGLObjectBuffers(unsigned int /*maxSize*/) {}
 
             /** If State is non-zero, this function releases any associated OpenGL objects for
             * the specified graphics context. Otherwise, releases OpenGL objects