diff --git a/Scene.h b/Scene.h
index 914f44b..4a8c9fa 100644
--- a/Scene.h
+++ b/Scene.h
@@ -143,7 +143,7 @@ class Scene : public IEGrScene
       bool SetGridShow( bool bShowGrid, bool bShowFrame) override ;
       bool SetGridGeo( double dSnapStep, int nMinLineSstep, int nMajLineSstep, int nExtSstep) override ;
       bool SetGridColor( Color colMinLine, Color colMajLine) override ;
-      void GetGridParam( double* pdSnapStep, int* pnExtStep) const override ;
+      void GetGridParam( double& dSnapStep, int& nExtStep) const override ;
      // Glob Frame
       bool SetGlobFrameShow( bool bShow) override ;
      // Direct
diff --git a/SceneGrid.cpp b/SceneGrid.cpp
index 60b5f59..d252e9f 100644
--- a/SceneGrid.cpp
+++ b/SceneGrid.cpp
@@ -200,10 +200,8 @@ Scene::DrawGrid( void)
 
 //----------------------------------------------------------------------------
 void 
-Scene::GetGridParam(double* pdSnapStep, int* pnExtStep) const
+Scene::GetGridParam(double& dSnapStep, int& nExtStep) const
 {
-    if ( pdSnapStep != nullptr)
-        *pdSnapStep = m_dSnapStep ;
-    if ( pnExtStep != nullptr)
-        *pnExtStep = m_nExtSstep ;
+   dSnapStep = m_dSnapStep ;
+   nExtStep = m_nExtSstep ;
 }
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