diff --git a/src/ifcgeom/IfcGeom.h b/src/ifcgeom/IfcGeom.h
index 78d8ded544..94f6f51290 100644
--- a/src/ifcgeom/IfcGeom.h
+++ b/src/ifcgeom/IfcGeom.h
@@ -121,7 +121,7 @@ public:
 	double face_area(const TopoDS_Face& f);
 	void apply_tolerance(TopoDS_Shape& s, double t);
 	void setValue(GeomValue var, double value);
-	double getValue(GeomValue var);
+	double getValue(GeomValue var) const;
 	bool fill_nonmanifold_wires_with_planar_faces(TopoDS_Shape& shape);
 	void remove_redundant_points_from_loop(TColgp_SequenceOfPnt& polygon, bool closed, double tol=-1.);
 
diff --git a/src/ifcgeom/IfcGeomFunctions.cpp b/src/ifcgeom/IfcGeomFunctions.cpp
index c8e430283f..4fbd154d39 100644
--- a/src/ifcgeom/IfcGeomFunctions.cpp
+++ b/src/ifcgeom/IfcGeomFunctions.cpp
@@ -554,7 +554,7 @@ void IfcGeom::Kernel::setValue(GeomValue var, double value) {
 	}
 }
 
-double IfcGeom::Kernel::getValue(GeomValue var) {
+double IfcGeom::Kernel::getValue(GeomValue var) const {
 	switch (var) {
 	case GV_DEFLECTION_TOLERANCE:
 		return deflection_tolerance;