diff --git a/src/tests/t0NotEqFirstGoodData/PAddPoissonNoise.cpp b/src/tests/t0NotEqFirstGoodData/PAddPoissonNoise.cpp
index 7554634a..bc8f2cbe 100644
--- a/src/tests/t0NotEqFirstGoodData/PAddPoissonNoise.cpp
+++ b/src/tests/t0NotEqFirstGoodData/PAddPoissonNoise.cpp
@@ -119,7 +119,7 @@ void PAddPoissonNoise::AddNoise(TH1F *histo)
     return;
 
   Double_t dval;
-  for (UInt_t i=1; i<histo->GetEntries(); i++) {
+  for (UInt_t i=1; i<(UInt_t)histo->GetNbinsX(); i++) {
     dval = histo->GetBinContent(i);
     histo->SetBinContent(i, PoiDev(dval));
   }