--- branches/development/src/nonbonded/MAW.cpp	2013/01/09 19:41:48	1826
+++ branches/development/src/nonbonded/MAW.cpp	2013/05/15 15:09:35	1874
@@ -35,7 +35,7 @@
  *                                                                      
  * [1]  Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).             
  * [2]  Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).          
- * [3]  Sun, Lin & Gezelter, J. Chem. Phys. 128, 24107 (2008).          
+ * [3]  Sun, Lin & Gezelter, J. Chem. Phys. 128, 234107 (2008).          
  * [4]  Kuang & Gezelter,  J. Chem. Phys. 133, 164101 (2010).
  * [5]  Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
  */
@@ -174,7 +174,7 @@ namespace OpenMD {
         myDerivC = 0.0;
       } else if (idat.shiftedForce) {
         myPotC = D_e * (expfnc2C - 2.0 * expfncC);
-        myDerivC  = 2.0 * D_e * beta * (expfnc2C - expfnc2C);
+        myDerivC  = 2.0 * D_e * beta * (expfncC - expfnc2C);
         myPotC += myDerivC * ( *(idat.rij)  -  *(idat.rcut) );
       } else {
         myPotC = 0.0;