diff --git a/src/Mod/Part/App/Geometry.cpp b/src/Mod/Part/App/Geometry.cpp
index 9c3ba11ce2..be49c911c0 100644
--- a/src/Mod/Part/App/Geometry.cpp
+++ b/src/Mod/Part/App/Geometry.cpp
@@ -1329,6 +1329,11 @@ bool GeomBSplineCurve::isPeriodic() const
     return myCurve->IsPeriodic()==Standard_True;
 }
 
+bool GeomBSplineCurve::isRational() const
+{
+    return myCurve->IsRational()==Standard_True;
+}
+
 bool GeomBSplineCurve::join(const Handle(Geom_BSplineCurve)& spline)
 {
     GeomConvert_CompCurveToBSplineCurve ccbc(this->myCurve);
diff --git a/src/Mod/Part/App/Geometry.h b/src/Mod/Part/App/Geometry.h
index e594ce5f47..d52d09fa40 100644
--- a/src/Mod/Part/App/Geometry.h
+++ b/src/Mod/Part/App/Geometry.h
@@ -296,6 +296,7 @@ public:
     int getMultiplicity(int index) const;
     int getDegree() const;
     bool isPeriodic() const;
+    bool isRational() const;
     bool join(const Handle(Geom_BSplineCurve)&);
     void makeC1Continuous(double, double);
     std::list<Geometry*> toBiArcs(double tolerance) const;