diff --git a/src/osgPlugins/lwo/Surface.cpp b/src/osgPlugins/lwo/Surface.cpp
index 27d68ecb0..2b0343911 100644
--- a/src/osgPlugins/lwo/Surface.cpp
+++ b/src/osgPlugins/lwo/Surface.cpp
@@ -128,7 +128,7 @@ void Surface::compile(const lwo2::FORM::SURF *surf, const Clip_map &clips)
     }
 }
 
-void Surface::generate_stateset(int max_tex_units, bool force_arb_compression, const osgDB::ReaderWriter::Options* db_options) const
+void Surface::generate_stateset(unsigned int max_tex_units, bool force_arb_compression, const osgDB::ReaderWriter::Options* db_options) const
 {
     if (!stateset_.valid()) {
 
diff --git a/src/osgPlugins/lwo/Surface.h b/src/osgPlugins/lwo/Surface.h
index abb83df21..d21b2ecd2 100644
--- a/src/osgPlugins/lwo/Surface.h
+++ b/src/osgPlugins/lwo/Surface.h
@@ -46,7 +46,7 @@ namespace lwosg
 
         osg::Group *apply(osg::Geometry *geo, const VertexMap_map *texture_maps, const VertexMap_map *rgb_maps, const VertexMap_map *rgba_maps, int max_tex_units, bool use_osgfx, bool force_arb_compression, const VertexMap_binding_map &texmap_bindings, const osgDB::ReaderWriter::Options *db_options) const;
 
-        void generate_stateset(int max_tex_units, bool force_arb_compression, const osgDB::ReaderWriter::Options* options) const;
+        void generate_stateset(unsigned int max_tex_units, bool force_arb_compression, const osgDB::ReaderWriter::Options* options) const;
 
         inline const std::string &get_name() const { return name_; }
         inline void set_name(const std::string &n) { name_ = n; }