diff --git a/src/AMOEBA/improper_amoeba.h b/src/AMOEBA/improper_amoeba.h
index d5a783a82f..f997b61629 100644
--- a/src/AMOEBA/improper_amoeba.h
+++ b/src/AMOEBA/improper_amoeba.h
@@ -34,6 +34,7 @@ class ImproperAmoeba : public Improper {
   void write_restart(FILE *) override;
   void read_restart(FILE *) override;
   void write_data(FILE *) override;
+  void *extract(const char *, int &) override;
 
  protected:
   int disable;