diff --git a/FDTD/operator_cylinder.cpp b/FDTD/operator_cylinder.cpp
index d956b3e..aa334db 100644
--- a/FDTD/operator_cylinder.cpp
+++ b/FDTD/operator_cylinder.cpp
@@ -55,9 +55,6 @@ void Operator_Cylinder::Reset()
 void Operator_Cylinder::InitOperator()
 {
 	__OP_CYLINDER_BASE_CLASS__::InitOperator();
-
-	if (CC_closedAlpha || CC_R0_included)
-		this->AddExtension(new Operator_Ext_Cylinder(this));
 }
 
 inline unsigned int Operator_Cylinder::GetNumberOfLines(int ny) const
@@ -148,6 +145,9 @@ bool Operator_Cylinder::SetGeometryCSX(ContinuousStructure* geo)
 		CC_R0_included= true;  //also needed for correct ec-calculation
 	}
 
+	if (CC_closedAlpha || CC_R0_included)
+		this->AddExtension(new Operator_Ext_Cylinder(this));
+
 	return true;
 }