diff --git a/src/Pstream/mpi/IPread.C b/src/Pstream/mpi/IPread.C
index 487749b24b..ac7c2e787a 100644
--- a/src/Pstream/mpi/IPread.C
+++ b/src/Pstream/mpi/IPread.C
@@ -193,15 +193,13 @@ void Foam::IPstream::waitRequests()
 {
     if (IPstream_outstandingRequests_.size() > 0)
     {
-        List<MPI_Status> status(IPstream_outstandingRequests_.size());
-
         if
         (
             MPI_Waitall
             (
                 IPstream_outstandingRequests_.size(),
                 IPstream_outstandingRequests_.begin(),
-                status.begin()
+                MPI_STATUSES_IGNORE
             )
         )
         {
@@ -231,9 +229,7 @@ bool Foam::IPstream::finishedRequest(const label i)
     }
 
     int flag;
-    MPI_Status status;
-
-    MPI_Test(&IPstream_outstandingRequests_[i], &flag, &status);
+    MPI_Test(&IPstream_outstandingRequests_[i], &flag, MPI_STATUS_IGNORE);
 
     return flag != 0;
 }
diff --git a/src/Pstream/mpi/OPwrite.C b/src/Pstream/mpi/OPwrite.C
index 86d9c998ab..d0cdcbd0bc 100644
--- a/src/Pstream/mpi/OPwrite.C
+++ b/src/Pstream/mpi/OPwrite.C
@@ -131,15 +131,13 @@ void Foam::OPstream::waitRequests()
 {
     if (OPstream_outstandingRequests_.size() > 0)
     {
-        List<MPI_Status> status(OPstream_outstandingRequests_.size());
-
         if
         (
             MPI_Waitall
             (
                 OPstream_outstandingRequests_.size(),
                 OPstream_outstandingRequests_.begin(),
-                status.begin()
+                MPI_STATUSES_IGNORE
             )
         )
         {
@@ -169,9 +167,7 @@ bool Foam::OPstream::finishedRequest(const label i)
     }
 
     int flag;
-    MPI_Status status;
-
-    MPI_Test(&OPstream_outstandingRequests_[i], &flag, &status);
+    MPI_Test(&OPstream_outstandingRequests_[i], &flag, MPI_STATUS_IGNORE);
 
     return flag != 0;
 }
diff --git a/src/Pstream/mpi/Pstream.C b/src/Pstream/mpi/Pstream.C
index a6361ab102..caa21b6dcc 100644
--- a/src/Pstream/mpi/Pstream.C
+++ b/src/Pstream/mpi/Pstream.C
@@ -157,8 +157,6 @@ void Foam::reduce(scalar& Value, const sumOp<scalar>& bop)
 
     if (Pstream::nProcs() <= Pstream::nProcsSimpleSum)
     {
-        MPI_Status status;
-
         if (Pstream::master())
         {
             for
@@ -180,7 +178,7 @@ void Foam::reduce(scalar& Value, const sumOp<scalar>& bop)
                         Pstream::procID(slave),
                         Pstream::msgType(),
                         MPI_COMM_WORLD,
-                        &status
+                        MPI_STATUS_IGNORE
                     )
                 )
                 {
@@ -260,7 +258,7 @@ void Foam::reduce(scalar& Value, const sumOp<scalar>& bop)
                     Pstream::procID(Pstream::masterNo()),
                     Pstream::msgType(),
                     MPI_COMM_WORLD,
-                    &status
+                    MPI_STATUS_IGNORE
                 )
             )
             {
@@ -279,8 +277,6 @@ void Foam::reduce(scalar& Value, const sumOp<scalar>& bop)
         Value = sum;
 
         /*
-        MPI_Status status;
-
         int myProcNo = Pstream::myProcNo();
         int nProcs = Pstream::nProcs();
 
@@ -314,7 +310,7 @@ void Foam::reduce(scalar& Value, const sumOp<scalar>& bop)
                         Pstream::procID(childProcId),
                         Pstream::msgType(),
                         MPI_COMM_WORLD,
-                        &status
+                        MPI_STATUS_IGNORE
                     )
                 )
                 {
@@ -370,7 +366,7 @@ void Foam::reduce(scalar& Value, const sumOp<scalar>& bop)
                     Pstream::procID(parentId),
                     Pstream::msgType(),
                     MPI_COMM_WORLD,
-                    &status
+                    MPI_STATUS_IGNORE
                 )
             )
             {