diff --git a/src/matlab/+D3d/+Polygon/MakePlaneBetween.m b/src/matlab/+D3d/+Polygon/MakePlaneBetween.m
index 7dd6033d9e67c93b383099ddfae4fde6b92c9669..babf5c4ffc1d6acc1ea6177e1b9d759cf2c6dac3 100644
--- a/src/matlab/+D3d/+Polygon/MakePlaneBetween.m
+++ b/src/matlab/+D3d/+Polygon/MakePlaneBetween.m
@@ -13,7 +13,7 @@ function [polygon] = MakePlaneBetween(pt1_xy,pt2_xy,polygonListIndex,strLabel,fr
 
 	[ inds, verts] = D3d.Polygon.CreatePlane(normVec, centerPoint, sideLength, sideLength);
 
-	polygon.faces = inds;
+	polygon(1).faces = inds;
 	polygon.verts = verts;
 	polygon.norms = repmat(normVec,size(verts,1),1);