diff --git a/PWGDQ/Core/HistogramsLibrary.cxx b/PWGDQ/Core/HistogramsLibrary.cxx
index 1955e110123..42522f0850f 100644
--- a/PWGDQ/Core/HistogramsLibrary.cxx
+++ b/PWGDQ/Core/HistogramsLibrary.cxx
@@ -675,6 +675,7 @@ void o2::aod::dqhistograms::DefineHistograms(HistogramManager* hm, const char* h
       }
       if (subGroupStr.Contains("dimuon-vtxncontrib")) {
         hm->AddHistogram(histClass, "MassMult", "", false, 750, 0.0, 15.0, VarManager::kMass, 301, -0.5, 300.5, VarManager::kVtxNcontrib);
+        hm->AddHistogram(histClass, "MassVtxZMult", "", false, 300, 0.0, 6.0, VarManager::kMass, 60, -15.0, 15.0, VarManager::kVtxZ, 100, 0.0, 100.0, VarManager::kVtxNcontrib);
       }
     } else if (subGroupStr.Contains("electronmuon")) {
       hm->AddHistogram(histClass, "Mass", "", false, 750, 0.0, 30.0, VarManager::kMass);