diff --git a/benchmarks/imaging_ecal/scripts/utils.py b/benchmarks/imaging_ecal/scripts/utils.py
index c65e32c69bac6480fef718d2ced17a2b5d332675..2872bf36b712b5c7ddd52e8da1c0ef1edee6aec0 100644
--- a/benchmarks/imaging_ecal/scripts/utils.py
+++ b/benchmarks/imaging_ecal/scripts/utils.py
@@ -94,7 +94,7 @@ def get_all_mcp(path, evnums=None, branch='MCParticles'):
     elif isinstance(evnums, int):
         evnums = [evnums]
 
-    dbuf = np.zeros(shape=(2000*len(evnums), 10))
+    dbuf = np.zeros(shape=(2000*len(evnums), 9))
     idb = 0
     for iev in evnums:
         if iev >= events.GetEntries():