diff --git a/src/OPENMP/fix_rigid_omp.cpp b/src/OPENMP/fix_rigid_omp.cpp
index 75794b3419..3a9965b0ee 100644
--- a/src/OPENMP/fix_rigid_omp.cpp
+++ b/src/OPENMP/fix_rigid_omp.cpp
@@ -491,11 +491,11 @@ void FixRigidOMP::set_xv_thr()
     double theta_body,theta;
     double ione[3],exone[3],eyone[3],ezone[3],p[3][3];
 
-    AtomVecEllipsoid::Bonus *ebonus;
+    AtomVecEllipsoid::Bonus *ebonus = nullptr;
     if (avec_ellipsoid) ebonus = avec_ellipsoid->bonus;
-    AtomVecLine::Bonus *lbonus;
+    AtomVecLine::Bonus *lbonus = nullptr;
     if (avec_line) lbonus = avec_line->bonus;
-    AtomVecTri::Bonus *tbonus;
+    AtomVecTri::Bonus *tbonus = nullptr;
     if (avec_tri) tbonus = avec_tri->bonus;
     double **omega_one = atom->omega;
     double **angmom_one = atom->angmom;
diff --git a/src/RIGID/fix_rigid.cpp b/src/RIGID/fix_rigid.cpp
index f4b82e1fd2..421a6cce2b 100644
--- a/src/RIGID/fix_rigid.cpp
+++ b/src/RIGID/fix_rigid.cpp
@@ -1463,11 +1463,11 @@ void FixRigid::set_xv()
     double theta_body,theta;
     double *shape,*quatatom,*inertiaatom;
 
-    AtomVecEllipsoid::Bonus *ebonus;
+    AtomVecEllipsoid::Bonus *ebonus = nullptr;
     if (avec_ellipsoid) ebonus = avec_ellipsoid->bonus;
-    AtomVecLine::Bonus *lbonus;
+    AtomVecLine::Bonus *lbonus = nullptr;
     if (avec_line) lbonus = avec_line->bonus;
-    AtomVecTri::Bonus *tbonus;
+    AtomVecTri::Bonus *tbonus = nullptr;
     if (avec_tri) tbonus = avec_tri->bonus;
     double **omega_one = atom->omega;
     double **angmom_one = atom->angmom;