diff --git a/matlab/AddStripLinePort.m b/matlab/AddStripLinePort.m
index 96b5a61..70dd065 100644
--- a/matlab/AddStripLinePort.m
+++ b/matlab/AddStripLinePort.m
@@ -203,7 +203,7 @@ CSX = AddProbe( CSX, port.U_filename{3,1}, 0, 'weight', weight );
 CSX = AddBox( CSX, port.U_filename{3,1}, prio, v3_start, v3_stop+height_vector );
 
 port.U_filename{3,2} = [PortNamePrefix 'port_ut' num2str(portnr) 'C2'];
-CSX = AddProbe( CSX, port.U_filename{3,2}, 0, 'weight', weight );
+CSX = AddProbe( CSX, port.U_filename{3,2}, 0, 'weight', -1*weight );
 CSX = AddBox( CSX, port.U_filename{3,2}, prio, v3_start, v3_stop-height_vector );
 
 % calculate position of the current probes