diff --git a/scripts/ztplot.py b/scripts/ztplot.py
index 36cea5d2d2734eee54212334a59497a6957ceac6..5d006b108e05fb93bf6bc0905d274cdc2ddaee3f 100755
--- a/scripts/ztplot.py
+++ b/scripts/ztplot.py
@@ -72,7 +72,7 @@ class ZTPlot(Module):
         if 'Hits' not in blob:
             return blob
 
-        hits = blob['Hits'].serialise(to='pandas')
+        hits = blob['Hits']
         hits = self.calib.apply(hits)
         event_info = blob['EventInfo']