diff --git a/examples/FCCee/fullSim/caloNtupleizer/analysis.py b/examples/FCCee/fullSim/caloNtupleizer/analysis.py
index 5811d6f1c7..1e2f5d3230 100644
--- a/examples/FCCee/fullSim/caloNtupleizer/analysis.py
+++ b/examples/FCCee/fullSim/caloNtupleizer/analysis.py
@@ -47,6 +47,7 @@ def __init__(self, inputlist, outname, ncpu):
             self.outname+=".root"
 
         ROOT.ROOT.EnableImplicitMT(ncpu)
+        ROOT.gInterpreter.Declare("using namespace FCCAnalyses;")
 
         self.df = ROOT.RDataFrame("events", inputlist)
         if args.useGeometry: