diff --git a/src/atom_vec.cpp b/src/atom_vec.cpp
index 7f5ba6507581d596ae511b0e63f7398ddd7c88c9..14091cbb77ff41bbb8864f717c96ef97c6958455 100644
--- a/src/atom_vec.cpp
+++ b/src/atom_vec.cpp
@@ -291,7 +291,7 @@ int AtomVec::pack_dihedral(tagint **buf)
   if (newton_bond) {
     for (i = 0; i < nlocal; i++)
       for (j = 0; j < num_dihedral[i]; j++) {
-      	if (buf) {
+        if (buf) {
           buf[m][0] = MAX(dihedral_type[i][j],-dihedral_type[i][j]);
           buf[m][1] = dihedral_atom1[i][j];
           buf[m][2] = dihedral_atom2[i][j];