diff --git a/src/EXTRA-MOLECULE/angle_cosine_shift.h b/src/EXTRA-MOLECULE/angle_cosine_shift.h
index c4dfe6c923..fbf6437431 100644
--- a/src/EXTRA-MOLECULE/angle_cosine_shift.h
+++ b/src/EXTRA-MOLECULE/angle_cosine_shift.h
@@ -35,7 +35,6 @@ class AngleCosineShift : public Angle {
   void read_restart(FILE *) override;
   void write_data(FILE *) override;
   double single(int, int, int, int) override;
-  void born_matrix(int type, int i1, int i2, int i3, double &du, double &du2) override;
 
  protected:
   double *k;