diff --git a/one_sided.cpp b/one_sided.cpp
index 5cf47ef..296c9c2 100644
--- a/one_sided.cpp
+++ b/one_sided.cpp
@@ -39,7 +39,7 @@ int main(int argc, char **argv) {
   std::cout << "rank " << rank << " put to " << target << std::endl << std::flush;
   MPI_Put(&rank, 1, MPI_INT, target, 0, 1, MPI_INT, win);   
 
-  MPI_Barrier(MPI_COMM_WORLD);
+  MPI_Win_fence(0, win);
 
   int err = 0;