diff --git a/src/ifcgeom/mapping/mapping.h b/src/ifcgeom/mapping/mapping.h
index b40ef40723..ed6518b458 100644
--- a/src/ifcgeom/mapping/mapping.h
+++ b/src/ifcgeom/mapping/mapping.h
@@ -39,7 +39,7 @@ namespace geometry {
 		virtual void initialize_settings();
 		virtual double get_length_unit() const { return length_unit_; }
 		virtual aggregate_of_instance::ptr find_openings(const IfcUtil::IfcBaseEntity*);
-		virtual IfcUtil::IfcBaseEntity* representation_of(const const IfcUtil::IfcBaseEntity* product);
+		virtual IfcUtil::IfcBaseEntity* representation_of(const IfcUtil::IfcBaseEntity* product);
 
 		void apply_settings();