diff --git a/src/CLASS2/pair_lj_class2_coul_cut.cpp b/src/CLASS2/pair_lj_class2_coul_cut.cpp
index 5cd5ad0e32..8c1a5bf560 100644
--- a/src/CLASS2/pair_lj_class2_coul_cut.cpp
+++ b/src/CLASS2/pair_lj_class2_coul_cut.cpp
@@ -14,6 +14,7 @@
 #include <cmath>
 #include <cstdio>
 #include <cstdlib>
+#include <cstring>
 #include "pair_lj_class2_coul_cut.h"
 #include "atom.h"
 #include "comm.h"
@@ -466,3 +467,16 @@ double PairLJClass2CoulCut::single(int i, int j, int itype, int jtype,
 
   return eng;
 }
+
+/* ---------------------------------------------------------------------- */
+
+void *PairLJClass2CoulCut::extract(const char *str, int &dim)
+{
+  dim = 0;
+  if (strcmp(str,"cut_coul") == 0) return (void *) &cut_coul;
+  dim = 2;
+  if (strcmp(str,"epsilon") == 0) return (void *) epsilon;
+  if (strcmp(str,"sigma") == 0) return (void *) sigma;
+  return NULL;
+}
+