diff --git a/benchmarks/dvmp/analysis/vm_invar.cxx b/benchmarks/dvmp/analysis/vm_invar.cxx
index 90ffc781d3e228abc2a38f650b86eb8fcb80ad03..9c8544298086dd15e7e975894ff47f497ef5b240 100644
--- a/benchmarks/dvmp/analysis/vm_invar.cxx
+++ b/benchmarks/dvmp/analysis/vm_invar.cxx
@@ -237,7 +237,7 @@ int vm_invar(const std::string& config_name)
       c3.Divide(2, 2, 0.0001, 0.0001);
       // pad 4 t
       c3.cd(4);
-      auto& ht_delta_t = *ht_delta_t;
+      auto& ht_delta_t = *h_delta_t;
       // histogram style
       ht_delta_t.SetLineColor(plot::kMpOrange);
       ht_delta_t.SetLineWidth(1);