diff --git a/FDTD/operator.cpp b/FDTD/operator.cpp
index 620ffa9..b8d2614 100644
--- a/FDTD/operator.cpp
+++ b/FDTD/operator.cpp
@@ -679,13 +679,13 @@ bool Operator::CalcPEC()
 	{
 		for (pos[2]=0;pos[2]<numLines[2];++pos[2])
 		{
-			coord[2] = discLines[2][pos[2]];
 			for (pos[1]=0;pos[1]<numLines[1];++pos[1])
 			{
-				coord[1] = discLines[1][pos[1]];
 				for (pos[0]=0;pos[0]<numLines[0];++pos[0])
 				{
 					coord[0] = discLines[0][pos[0]];
+					coord[1] = discLines[1][pos[1]];
+					coord[2] = discLines[2][pos[2]];
 					MainOp->SetPos(pos[0],pos[1],pos[2]);
 					delta=MainOp->GetIndexDelta(n,pos[n]);
 					coord[n]= discLines[n][pos[n]] + delta*0.5;