diff --git a/src/Mod/Part/App/Geometry.cpp b/src/Mod/Part/App/Geometry.cpp
index 6c76829f1a..6678de8645 100644
--- a/src/Mod/Part/App/Geometry.cpp
+++ b/src/Mod/Part/App/Geometry.cpp
@@ -363,7 +363,7 @@ bool GeomCurve::normal(double u, gp_Dir& dir) const
     return false;
 }
 
-bool GeomCurve::closestParameter(Base::Vector3d point, double &u) const
+bool GeomCurve::closestParameter(const Base::Vector3d& point, double &u) const
 {
     Handle_Geom_Curve c = Handle_Geom_Curve::DownCast(handle());
     try {
@@ -383,7 +383,7 @@ bool GeomCurve::closestParameter(Base::Vector3d point, double &u) const
     return false;
 }
 
-bool GeomCurve::closestParameterToBasicCurve(Base::Vector3d point, double &u) const
+bool GeomCurve::closestParameterToBasicCurve(const Base::Vector3d& point, double &u) const
 {
     Handle_Geom_Curve c = Handle_Geom_Curve::DownCast(handle());
     
diff --git a/src/Mod/Part/App/Geometry.h b/src/Mod/Part/App/Geometry.h
index 3470f09aff..d6eab2dd61 100644
--- a/src/Mod/Part/App/Geometry.h
+++ b/src/Mod/Part/App/Geometry.h
@@ -119,8 +119,8 @@ public:
     Base::Vector3d firstDerivativeAtParameter(double u) const;
     Base::Vector3d secondDerivativeAtParameter(double u) const;
     bool normal(double u, gp_Dir& dir) const;
-    bool closestParameter(Base::Vector3d point, double &u) const;
-    bool closestParameterToBasicCurve(Base::Vector3d point, double &u) const;
+    bool closestParameter(const Base::Vector3d& point, double &u) const;
+    bool closestParameterToBasicCurve(const Base::Vector3d& point, double &u) const;
 };
 
 class PartExport GeomBezierCurve : public GeomCurve