diff --git a/scripts/acoustics.py b/scripts/acoustics.py
index 465635bd39e6a456bede38b3f9ff20ce7a79062b..c6237dbce92149b4c5ec15f3bc91010b163c3a62 100644
--- a/scripts/acoustics.py
+++ b/scripts/acoustics.py
@@ -48,7 +48,8 @@ table=db.run_table(detid)
 ACOUSTIC_BEACONS = [12, 14, 16]
 N_DOMS = 18
 DOMS = range(N_DOMS + 1)
-DU=[1,2,3,4,5] # DUs
+N_DUS = 5
+DUS = range(1, N_DUS + 1)
 
 #ACOUSTIC_BEACONS=[16] # Acoustic Beacons
 #DOM=[7] #