diff --git a/src/osgPlugins/ac/Geode.cpp b/src/osgPlugins/ac/Geode.cpp
index 7421d32ea..e656ae94e 100644
--- a/src/osgPlugins/ac/Geode.cpp
+++ b/src/osgPlugins/ac/Geode.cpp
@@ -659,7 +659,7 @@ void Geode::OutputPolygonDelsUInt(const int iCurrentMaterial, const unsigned int
 }
 
 
-const int Geode::ProcessMaterial(ostream& fout, const unsigned int igeode)
+int Geode::ProcessMaterial(ostream& fout, const unsigned int igeode)
 {
     // outputs materials from one geode
     // extended for multiple geode models, GWM 2003.
diff --git a/src/osgPlugins/ac/Geode.h b/src/osgPlugins/ac/Geode.h
index acf86744a..65b88c971 100644
--- a/src/osgPlugins/ac/Geode.h
+++ b/src/osgPlugins/ac/Geode.h
@@ -9,7 +9,7 @@ namespace ac3d
     class Geode : public osg::Geode
     {
     public:
-        const int ProcessMaterial(std::ostream& fout, const unsigned int igeode);
+        int ProcessMaterial(std::ostream& fout, const unsigned int igeode);
         void ProcessGeometry(std::ostream& fout, const unsigned int igeode);
     private:
         void OutputTriangle(const int iCurrentMaterial,const unsigned int surfaceFlags,
diff --git a/src/osgPlugins/ac/ac3d.cpp b/src/osgPlugins/ac/ac3d.cpp
index 7c315a4a9..acca77b46 100644
--- a/src/osgPlugins/ac/ac3d.cpp
+++ b/src/osgPlugins/ac/ac3d.cpp
@@ -768,7 +768,7 @@ class LineBin : public PrimitiveBin
         return true;
     }
 
-    virtual osg::Geode* finalize(const MaterialData& material, const TextureData& textureData)
+    virtual osg::Geode* finalize(const MaterialData& material, const TextureData& /*textureData*/)
     {
         _geode->addDrawable(_geometry.get());
         material.toStateSet(_geode->getOrCreateStateSet());