diff --git a/src/CLASS2/improper_class2.cpp b/src/CLASS2/improper_class2.cpp
index 6b6d503d44..628a106300 100644
--- a/src/CLASS2/improper_class2.cpp
+++ b/src/CLASS2/improper_class2.cpp
@@ -36,7 +36,10 @@ using namespace MathConst;
 
 /* ---------------------------------------------------------------------- */
 
-ImproperClass2::ImproperClass2(LAMMPS *lmp) : Improper(lmp) {}
+ImproperClass2::ImproperClass2(LAMMPS *lmp) : Improper(lmp)
+{
+  writedata = 1;
+}
 
 /* ---------------------------------------------------------------------- */
 
@@ -835,3 +838,19 @@ double ImproperClass2::dot(double *a, double *b)
 {
   return (a[0]*b[0] + a[1]*b[1] + a[2]*b[2]);
 }
+
+/* ----------------------------------------------------------------------
+   proc 0 writes to data file
+------------------------------------------------------------------------- */
+
+void ImproperClass2::write_data(FILE *fp)
+{
+  for (int i = 1; i <= atom->nimpropertypes; i++)
+    fprintf(fp,"%d %g %g\n",i,k0[i],chi0[i]);
+
+  fprintf(fp,"\nAngleAngle Coeffs\n\n");
+  for (int i = 1; i <= atom->nimpropertypes; i++)
+    fprintf(fp,"%d %g %g %g %g %g %g\n",i,aa_k1[i],aa_k2[i],aa_k3[i],
+            aa_theta0_1[i]*180.0/MY_PI,aa_theta0_2[i]*180.0/MY_PI,
+            aa_theta0_3[i]*180.0/MY_PI);  
+}
diff --git a/src/CLASS2/improper_class2.h b/src/CLASS2/improper_class2.h
index 33d460d562..33ddd8cde0 100644
--- a/src/CLASS2/improper_class2.h
+++ b/src/CLASS2/improper_class2.h
@@ -33,6 +33,7 @@ class ImproperClass2 : public Improper {
   void coeff(int, char **);
   void write_restart(FILE *);
   void read_restart(FILE *);
+  void write_data(FILE *);
 
  protected:
   double *k0,*chi0;