--- trunk/src/parallel/ForceDecomposition.cpp	2014/02/26 19:45:34	1970
+++ trunk/src/parallel/ForceDecomposition.cpp	2014/02/28 13:25:13	1971
@@ -168,7 +168,8 @@ namespace OpenMD {
     }
 
 #ifdef IS_MPI
-    MPI_Allreduce(&dispmax, &dispmax, 1, MPI_REALTYPE, MPI_MAX, MPI_COMM_WORLD);
+    MPI_Allreduce(MPI_IN_PLACE, &dispmax, 1, MPI_REALTYPE, MPI_MAX, 
+                  MPI_COMM_WORLD);
 #endif
 
     // a conservative test of list skin crossings