diff --git a/src/PluginExample/MyMappingPendulumInPlane.h b/src/PluginExample/MyMappingPendulumInPlane.h
index 8a091fb..23ddcb0 100644
--- a/src/PluginExample/MyMappingPendulumInPlane.h
+++ b/src/PluginExample/MyMappingPendulumInPlane.h
@@ -77,9 +77,10 @@ class MyMappingPendulumInPlane: public core::Mapping<TIn, TOut>
     virtual void applyJ(const core::MechanicalParams* mparams, OutDataVecDeriv& out, const InDataVecDeriv& in) override;
     virtual void applyJT(const core::MechanicalParams* mparams, InDataVecDeriv& out, const OutDataVecDeriv& in) override;
     virtual void applyJT(const core::ConstraintParams* mparams, InDataMatrixDeriv& out, const OutDataMatrixDeriv& in) override;
-    virtual void applyDJT(const core::MechanicalParams* mparams, core::MultiVecDerivId parentForceChange, core::ConstMultiVecDerivId) override;
 
 protected:
+    virtual void doApplyDJT(const core::MechanicalParams* mparams, core::MultiVecDerivId parentForceChange, core::ConstMultiVecDerivId) override;
+
     typedef Vec<2, OutReal> Vec2;
     vector<Vec2> gap;
 };
diff --git a/src/PluginExample/MyMappingPendulumInPlane.inl b/src/PluginExample/MyMappingPendulumInPlane.inl
index 319e793..72eb228 100644
--- a/src/PluginExample/MyMappingPendulumInPlane.inl
+++ b/src/PluginExample/MyMappingPendulumInPlane.inl
@@ -190,7 +190,7 @@ void MyMappingPendulumInPlane<In, Out>::applyJT(const core::ConstraintParams* cp
 }
 
 template <class In, class Out>
-void MyMappingPendulumInPlane<In, Out>::applyDJT(const core::MechanicalParams* mparams,
+void MyMappingPendulumInPlane<In, Out>::doApplyDJT(const core::MechanicalParams* mparams,
                                                 core::MultiVecDerivId parentForceChangeId,
                                                 core::ConstMultiVecDerivId)
 {