diff --git a/simgear/scene/tgdb/pt_lights.hxx b/simgear/scene/tgdb/pt_lights.hxx
index 863328dc..1097c4b6 100644
--- a/simgear/scene/tgdb/pt_lights.hxx
+++ b/simgear/scene/tgdb/pt_lights.hxx
@@ -55,7 +55,6 @@ class Effect;
 // appropriate extensions are available.)
 
 inline void SGConfigureDirectionalLights( bool use_point_sprites,
-                                   bool enhanced_lighting,
                                    bool distance_attenuation ) {
   static SGSceneFeatures* sceneFeatures = SGSceneFeatures::instance();
   sceneFeatures->setEnablePointSpriteLights(use_point_sprites);