diff --git a/scripts/live_triggermap.py b/scripts/live_triggermap.py
index 888b763124169838b36c24c5cfdc8a17fdd16984..ca517c60f508b4994ef1ac34321ba111cafb7512 100755
--- a/scripts/live_triggermap.py
+++ b/scripts/live_triggermap.py
@@ -79,7 +79,7 @@ class DOMHits(Module):
                 du, floor, _ = self.det.doms[dom_id]
                 hits[(du - 1) * self.det.n_doms + floor - 1] += 1
             self.hits.append(hits)
-            triggered_hits = np.zeros(self.det.n_doms * self.det.n_dus)
+            triggered_hits = np.zeros(self.det.n_doms)
             for dom_id in event_hits.dom_id[event_hits.triggered.astype(
                     'bool')]:
                 du, floor, _ = self.det.doms[dom_id]