diff --git a/applications/arts/commissioning/arts_sc4_tabs_weights.py b/applications/arts/commissioning/arts_sc4_tabs_weights.py
index d0d7a7b7a62dc8418071df4c7b2d3a32d07882d8..10532d8c5c22d20c9ff6801ba76c4f17fba2559c 100644
--- a/applications/arts/commissioning/arts_sc4_tabs_weights.py
+++ b/applications/arts/commissioning/arts_sc4_tabs_weights.py
@@ -57,7 +57,7 @@ num_dish_active = len(tc.telStrList)
 norm_factor = 255.0/math.sqrt(num_dish_active)
 print "application ", tc.appStr, "size of array ", num_dish, "number of telescopes:", num_dish_active, " normalization factor:  ", norm_factor
 
-beamweights = pi_arts_tab_beamformer_weights.BeamformerWeights(tc, io
+beamweights = pi_arts_tab_beamformer_weights.BeamformerWeights(tc, io,
                                                                 n_tabs=num_tabs,
                                                                 n_inputs=num_dish,
                                                                 n_beamlets=num_beamlets,