diff --git a/src/relay/pass/to_anf.cc b/src/relay/pass/to_anf.cc
index 35d8254c1d33c..9f90bebbb41a4 100644
--- a/src/relay/pass/to_anf.cc
+++ b/src/relay/pass/to_anf.cc
@@ -286,26 +286,22 @@ class CalcScope : ExprFunctor<void(const Expr&)> {
 
 class Fill : ExprFunctor<Expr(const Expr&, const Var&)> {
  public:
-  static Expr ToANF(const DependentGraph& dg,
-                    const ExprScopeMap& esm,
+  static Expr ToANF(const ExprScopeMap& esm,
                     const Module& m,
                     std::set<GlobalVar>* gv,
                     const Expr& e) {
-    Fill fi(dg, esm, m, gv);
+    Fill fi(esm, m, gv);
     return esm.global_scope->ll->Get(fi.VisitExpr(e));
   }
 
  private:
-  const DependentGraph& dg_;
   const ExprScopeMap& esm_;
   Module mod_;
   std::set<GlobalVar>* visited_;
 
-  Fill(const DependentGraph& dg,
-       const ExprScopeMap& esm,
+  Fill(const ExprScopeMap& esm,
        Module mod,
        std::set<GlobalVar>* visited) :
-    dg_(dg),
     esm_(esm),
     mod_(mod),
     visited_(visited) { }
@@ -408,7 +404,7 @@ Expr ToANFAux(const Expr& e, const Module& m, std::set<GlobalVar>* gv) {
   DependentGraph dg = ExprDep::Dependency(e);
   std::vector<Expr> topo = Topo::Sort(dg);
   ExprScopeMap esm = CalcScope::Calculate(dg, topo);
-  return Fill::ToANF(dg, esm, m, gv, e);
+  return Fill::ToANF(esm, m, gv, e);
 }
 
 Expr ToANF(const Expr& e, const Module& m, std::set<GlobalVar>* gv) {