diff --git a/src/EXTRA-MOLECULE/bond_fene_nm.cpp b/src/EXTRA-MOLECULE/bond_fene_nm.cpp
index 147a63512a..8abaf97bec 100644
--- a/src/EXTRA-MOLECULE/bond_fene_nm.cpp
+++ b/src/EXTRA-MOLECULE/bond_fene_nm.cpp
@@ -29,7 +29,7 @@ using namespace LAMMPS_NS;
 
 /* ---------------------------------------------------------------------- */
 
-BondFENENM::BondFENENM(LAMMPS *lmp) : BondFENE(lmp) {}
+BondFENENM::BondFENENM(LAMMPS *lmp) : BondFENE(lmp), nn(nullptr), mm(nullptr) {}
 
 /* ---------------------------------------------------------------------- */
 
diff --git a/src/EXTRA-MOLECULE/bond_fene_nm.h b/src/EXTRA-MOLECULE/bond_fene_nm.h
index f00394c6d8..4dbf64a331 100644
--- a/src/EXTRA-MOLECULE/bond_fene_nm.h
+++ b/src/EXTRA-MOLECULE/bond_fene_nm.h
@@ -38,7 +38,6 @@ class BondFENENM : public BondFENE {
   virtual void *extract(const char *, int &);
 
  protected:
-  double TWO_1_3;
   double *nn, *mm;
 
   virtual void allocate();