diff --git a/src/Pstream/mpi/UPstream.C b/src/Pstream/mpi/UPstream.C
index 1ba7dfbe33..4e105aa767 100644
--- a/src/Pstream/mpi/UPstream.C
+++ b/src/Pstream/mpi/UPstream.C
@@ -326,7 +326,7 @@ void Foam::UPstream::allToAll
             (
                 // NOTE: const_cast is a temporary hack for
                 // backward-compatibility with versions of OpenMPI < 1.7.4
-                const_cast<int*>(sendData.begin()),
+                const_cast<label*>(sendData.begin()),
                 sizeof(label),
                 MPI_BYTE,
                 recvData.begin(),