diff --git a/sidechain/src/scwrl3_rotamer_constructor.hh b/sidechain/src/scwrl3_rotamer_constructor.hh
index 4036ff20455bbb9d42e9b570d4467844ca145655..aeb37a5fc85c6be0a1388722bc790ad383250924 100644
--- a/sidechain/src/scwrl3_rotamer_constructor.hh
+++ b/sidechain/src/scwrl3_rotamer_constructor.hh
@@ -51,7 +51,8 @@ public:
 
 private:
 
-  void ParametrizeParticle(int atom_idx, bool is_hydrogen, Particle& p);
+  virtual void ParametrizeParticle(int atom_idx, bool is_hydrogen, 
+                                   Particle& p);
 };
 
 }} // ns
diff --git a/sidechain/src/scwrl4_rotamer_constructor.hh b/sidechain/src/scwrl4_rotamer_constructor.hh
index 79043a450415b783810488568170424ba3ae5d25..ebb86ad57517fc8180303fe03464bb7f8b86cf1f 100644
--- a/sidechain/src/scwrl4_rotamer_constructor.hh
+++ b/sidechain/src/scwrl4_rotamer_constructor.hh
@@ -58,7 +58,8 @@ public:
 
 private:
 
-  void ParametrizeParticle(int atom_idx, bool is_hydrogen, Particle& p);
+  virtual void ParametrizeParticle(int atom_idx, bool is_hydrogen, 
+                                   Particle& p);
 };
 
 }} // ns