diff --git a/src/output/slice.cpp b/src/output/slice.cpp
index ac94e988..10f210ab 100644
--- a/src/output/slice.cpp
+++ b/src/output/slice.cpp
@@ -172,10 +172,6 @@ void Slice::CheckForWrite(DataBlock &data) {
                     Kokkos::atomic_add(&Vcout(n,kt,jt,it) , Vcin(n,k,j,i)/ntot);
                   });
       #ifdef WITH_MPI
-        // Create a communicator on which we can do the sum accross processors
-        int remainDims[3] = {false, false, false};
-        remainDims[direction] = true;
-        MPI_Cart_sub(subgrid->parentGrid->CartComm, remainDims, &avgComm);
         MPI_Allreduce(MPI_IN_PLACE, Vcout.data(),
                       Vcout.extent(0)*Vcout.extent(1)*Vcout.extent(2)*Vcout.extent(3),
                       realMPI, MPI_SUM, avgComm);