diff --git a/FDTD/operator_cylinder.cpp b/FDTD/operator_cylinder.cpp
index 1539fb3..ea4a4de 100644
--- a/FDTD/operator_cylinder.cpp
+++ b/FDTD/operator_cylinder.cpp
@@ -222,6 +222,9 @@ bool Operator_Cylinder::SetupCSXGrid(CSRectGrid* grid)
 		if (g_settings.GetVerboseLevel()>0)
 			cout << "Operator_Cylinder::SetupCSXGrid: r=0 included..." << endl;
 		CC_R0_included = CC_closedAlpha;  //needed for correct ec-calculation, deactivate if closed cylinder is false... --> E_r = 0 anyways
+
+		// use conservative timestep for a mesh including the r==0 singularity
+		m_TimeStepVar = 1;
 	}
 
 #ifdef MPI_SUPPORT
@@ -288,9 +291,3 @@ void Operator_Cylinder::AddExtension(Operator_Extension* op_ext)
 	else
 		cerr << "Operator_Cylinder::AddExtension: Warning: Operator extension \"" << op_ext->GetExtensionName() << "\" is not compatible with cylinder-coords!! skipping...!" << endl;
 }
-
-double Operator_Cylinder::CalcTimestep()
-{
-	m_TimeStepVar = 1;
-	return Operator_Multithread::CalcTimestep();
-}
diff --git a/FDTD/operator_cylinder.h b/FDTD/operator_cylinder.h
index 8c5a9d2..e4c1824 100644
--- a/FDTD/operator_cylinder.h
+++ b/FDTD/operator_cylinder.h
@@ -74,9 +74,6 @@ protected:
 	Operator_Cylinder();
 	virtual void Init();
 
-	//Calc timestep only internal use
-	virtual double CalcTimestep();
-
 	virtual bool SetupCSXGrid(CSRectGrid* grid);
 
 	virtual double GetRawDiscDelta(int ny, const int pos) const;
diff --git a/FDTD/operator_cylindermultigrid.cpp b/FDTD/operator_cylindermultigrid.cpp
index d406c5a..2b4dfaa 100644
--- a/FDTD/operator_cylindermultigrid.cpp
+++ b/FDTD/operator_cylindermultigrid.cpp
@@ -65,6 +65,9 @@ bool Operator_CylinderMultiGrid::SetupCSXGrid(CSRectGrid* grid)
 	if (Operator_Cylinder::SetupCSXGrid(grid)==false)
 		return false;
 
+	// make this multigrid use the larger timestep by method 3, since no r==0 singularity can be part of this engine
+	m_TimeStepVar = 3;
+
 	if ((numLines[1]-CC_closedAlpha)%2 != 1)
 	{
 		cerr << "Operator_CylinderMultiGrid::SetupCSXGrid: Error, number of line in alpha direction must be odd... found: " << numLines[1] << endl;