diff --git a/Framework/Core/src/StepTHn.cxx b/Framework/Core/src/StepTHn.cxx
index a091c304f425a..8463fc233492a 100644
--- a/Framework/Core/src/StepTHn.cxx
+++ b/Framework/Core/src/StepTHn.cxx
@@ -327,6 +327,8 @@ void StepTHn::createTarget(Int_t step, Bool_t sparse)
   }
 
   THnBase* target = mTarget[step];
+  if (mSumw2[step])
+    target->Sumw2();
 
   Int_t* binIdx = new Int_t[mNVars];
   Int_t* nBins = new Int_t[mNVars];