diff --git a/src/MOLECULE/dihedral_opls.cpp b/src/MOLECULE/dihedral_opls.cpp
index 15a4b0a61e..074c8bf15c 100644
--- a/src/MOLECULE/dihedral_opls.cpp
+++ b/src/MOLECULE/dihedral_opls.cpp
@@ -35,7 +35,10 @@ using namespace LAMMPS_NS;
 
 /* ---------------------------------------------------------------------- */
 
-DihedralOPLS::DihedralOPLS(LAMMPS *lmp) : Dihedral(lmp) {}
+DihedralOPLS::DihedralOPLS(LAMMPS *lmp) : Dihedral(lmp)
+{
+  writedata = 1;
+}
 
 /* ---------------------------------------------------------------------- */
 
@@ -339,3 +342,14 @@ void DihedralOPLS::read_restart(FILE *fp)
 
   for (int i = 1; i <= atom->ndihedraltypes; i++) setflag[i] = 1;
 }
+
+/* ----------------------------------------------------------------------
+   proc 0 writes to data file
+------------------------------------------------------------------------- */
+
+void DihedralOPLS::write_data(FILE *fp)
+{
+  for (int i = 1; i <= atom->ndihedraltypes; i++)
+    fprintf(fp,"%d %g %g %g %g\n",i,2.0*k1[i],2.0*k2[i],2.0*k3[i],2.0*k4[i]);
+}
+
diff --git a/src/MOLECULE/dihedral_opls.h b/src/MOLECULE/dihedral_opls.h
index 500a5927a1..238a67cf3c 100644
--- a/src/MOLECULE/dihedral_opls.h
+++ b/src/MOLECULE/dihedral_opls.h
@@ -1,4 +1,4 @@
-/* ----------------------------------------------------------------------
+/* -*- c++ -*- ----------------------------------------------------------
    LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
    http://lammps.sandia.gov, Sandia National Laboratories
    Steve Plimpton, sjplimp@sandia.gov
@@ -33,6 +33,7 @@ class DihedralOPLS : public Dihedral {
   void coeff(int, char **);
   void write_restart(FILE *);
   void read_restart(FILE *);
+  void write_data(FILE *);
 
  protected:
   double *k1,*k2,*k3,*k4;