diff --git a/src/Mod/TechDraw/App/DrawProjectSplit.cpp b/src/Mod/TechDraw/App/DrawProjectSplit.cpp
index dccf85eb06..c1671cea7d 100644
--- a/src/Mod/TechDraw/App/DrawProjectSplit.cpp
+++ b/src/Mod/TechDraw/App/DrawProjectSplit.cpp
@@ -125,7 +125,7 @@ std::vector<TopoDS_Edge> DrawProjectSplit::getEdgesForWalker(TopoDS_Shape shape,
 
 
 TechDrawGeometry::GeometryObject* DrawProjectSplit::buildGeometryObject(TopoDS_Shape shape,
-                                                                        gp_Ax2 viewAxis)
+                                                                        const gp_Ax2& viewAxis)
 {
     TechDrawGeometry::GeometryObject* geometryObject = new TechDrawGeometry::GeometryObject("DrawProjectSplit");
 
diff --git a/src/Mod/TechDraw/App/DrawProjectSplit.h b/src/Mod/TechDraw/App/DrawProjectSplit.h
index 835024796f..24822c789b 100644
--- a/src/Mod/TechDraw/App/DrawProjectSplit.h
+++ b/src/Mod/TechDraw/App/DrawProjectSplit.h
@@ -36,6 +36,7 @@
 #include <Base/BoundBox.h>
 
 class gp_Pnt;
+class gp_Ax2;
 
 namespace TechDrawGeometry
 {
@@ -79,7 +80,7 @@ public:
 
 public:
     static std::vector<TopoDS_Edge> getEdgesForWalker(TopoDS_Shape shape, double scale, Base::Vector3d direction);
-    static TechDrawGeometry::GeometryObject*  buildGeometryObject(TopoDS_Shape shape, gp_Ax2 viewAxis);
+    static TechDrawGeometry::GeometryObject*  buildGeometryObject(TopoDS_Shape shape, const gp_Ax2& viewAxis);
 
     static bool isOnEdge(TopoDS_Edge e, TopoDS_Vertex v, double& param, bool allowEnds = false);
     static std::vector<TopoDS_Edge> splitEdges(std::vector<TopoDS_Edge> orig, std::vector<splitPoint> splits);