--- branches/new_design/OOPSE-3.0/src/types/MorseBondType.hpp	2004/11/17 18:58:49	1747
+++ branches/new_design/OOPSE-3.0/src/types/MorseBondType.hpp	2004/11/17 21:47:42	1748
@@ -38,7 +38,7 @@ namespace oopse {
 
     double getForceConstant() {return 2.0*De*beta*beta;}
 
-    void calcForce(double r, double& V, double& dVdr) {
+    virtual void calcForce(double r, double& V, double& dVdr) {
       double dr, eterm, eterm2;
 
       dr = r - r0;