diff --git a/ompi/mpi/c/ialltoallv.c b/ompi/mpi/c/ialltoallv.c
index f10fd35f20..2ba6ef3505 100644
--- a/ompi/mpi/c/ialltoallv.c
+++ b/ompi/mpi/c/ialltoallv.c
@@ -89,6 +89,12 @@ int MPI_Ialltoallv(const void *sendbuf, const int sendcounts[], const int sdispl
                                           FUNC_NAME);
         }
 
+        if (MPI_IN_PLACE == sendbuf) {
+            sendcounts = recvcounts;
+            sdispls = rdispls;
+            sendtype = recvtype;
+        }
+
         if ((NULL == sendcounts) || (NULL == sdispls) ||
             (NULL == recvcounts) || (NULL == rdispls) ||
             (MPI_IN_PLACE == sendbuf && OMPI_COMM_IS_INTER(comm)) ||
@@ -103,10 +109,8 @@ int MPI_Ialltoallv(const void *sendbuf, const int sendcounts[], const int sdispl
 
         size = OMPI_COMM_IS_INTER(comm)?ompi_comm_remote_size(comm):ompi_comm_size(comm);
         for (i = 0; i < size; ++i) {
-            if (MPI_IN_PLACE != sendbuf) {
-                OMPI_CHECK_DATATYPE_FOR_SEND(err, sendtype, sendcounts[i]);
-                OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
-            }
+            OMPI_CHECK_DATATYPE_FOR_SEND(err, sendtype, sendcounts[i]);
+            OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
             OMPI_CHECK_DATATYPE_FOR_RECV(err, recvtype, recvcounts[i]);
             OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
         }
diff --git a/ompi/mpi/c/ialltoallw.c b/ompi/mpi/c/ialltoallw.c
index 615bf79e1e..076f82a379 100644
--- a/ompi/mpi/c/ialltoallw.c
+++ b/ompi/mpi/c/ialltoallw.c
@@ -69,7 +69,7 @@ int MPI_Ialltoallw(const void *sendbuf, const int sendcounts[], const int sdispl
             memchecker_datatype(recvtypes[i]);
             ompi_datatype_type_extent(recvtypes[i], &recv_ext);
             memchecker_call(&opal_memchecker_base_isaddressable,
-                            (char *)(recvbuf)+sdispls[i]*recv_ext,
+                            (char *)(recvbuf)+rdispls[i]*recv_ext,
                             recvcounts[i], recvtypes[i]);
         }
     );
@@ -85,6 +85,12 @@ int MPI_Ialltoallw(const void *sendbuf, const int sendcounts[], const int sdispl
                                           FUNC_NAME);
         }
 
+        if (MPI_IN_PLACE == sendbuf) {
+            sendcounts = recvcounts;
+            sdispls    = rdispls;
+            sendtypes  = recvtypes;
+        }
+
         if ((NULL == sendcounts) || (NULL == sdispls) || (NULL == sendtypes) ||
             (NULL == recvcounts) || (NULL == rdispls) || (NULL == recvtypes) ||
             (MPI_IN_PLACE == sendbuf && OMPI_COMM_IS_INTER(comm)) ||
@@ -99,10 +105,8 @@ int MPI_Ialltoallw(const void *sendbuf, const int sendcounts[], const int sdispl
 
         size = OMPI_COMM_IS_INTER(comm)?ompi_comm_remote_size(comm):ompi_comm_size(comm);
         for (i = 0; i < size; ++i) {
-            if (MPI_IN_PLACE != sendbuf) {
-                OMPI_CHECK_DATATYPE_FOR_SEND(err, sendtypes[i], sendcounts[i]);
-                OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
-            }
+            OMPI_CHECK_DATATYPE_FOR_SEND(err, sendtypes[i], sendcounts[i]);
+            OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
             OMPI_CHECK_DATATYPE_FOR_RECV(err, recvtypes[i], recvcounts[i]);
             OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
         }
diff --git a/ompi/mpi/fortran/mpif-h/alltoallw_f.c b/ompi/mpi/fortran/mpif-h/alltoallw_f.c
index effa20e749..cb2328cf97 100644
--- a/ompi/mpi/fortran/mpif-h/alltoallw_f.c
+++ b/ompi/mpi/fortran/mpif-h/alltoallw_f.c
@@ -98,7 +98,7 @@ void ompi_alltoallw_f(char *sendbuf, MPI_Fint *sendcounts,
         --size;
     }
 
-    /* Alltoallw does not support MPI_IN_PLACE */
+    sendbuf = (char *) OMPI_F2C_IN_PLACE(sendbuf);
     sendbuf = (char *) OMPI_F2C_BOTTOM(sendbuf);
     recvbuf = (char *) OMPI_F2C_BOTTOM(recvbuf);
 
diff --git a/ompi/mpi/fortran/mpif-h/exscan_f.c b/ompi/mpi/fortran/mpif-h/exscan_f.c
index 32a4612d20..9880301e2b 100644
--- a/ompi/mpi/fortran/mpif-h/exscan_f.c
+++ b/ompi/mpi/fortran/mpif-h/exscan_f.c
@@ -80,7 +80,7 @@ void ompi_exscan_f(char *sendbuf, char *recvbuf, MPI_Fint *count,
     c_type = PMPI_Type_f2c(*datatype);
     c_op = PMPI_Op_f2c(*op);
 
-    /* MPI_IN_PLACE is not supported */
+    sendbuf = (char *) OMPI_F2C_IN_PLACE(sendbuf);
     sendbuf = (char *) OMPI_F2C_BOTTOM (sendbuf);
     recvbuf = (char *) OMPI_F2C_BOTTOM (recvbuf);
 
diff --git a/ompi/mpi/fortran/mpif-h/ialltoallw_f.c b/ompi/mpi/fortran/mpif-h/ialltoallw_f.c
index 3ec36ada0e..85cedd932f 100644
--- a/ompi/mpi/fortran/mpif-h/ialltoallw_f.c
+++ b/ompi/mpi/fortran/mpif-h/ialltoallw_f.c
@@ -99,7 +99,7 @@ void ompi_ialltoallw_f(char *sendbuf, MPI_Fint *sendcounts,
         --size;
     }
 
-    /* Ialltoallw does not support MPI_IN_PLACE */
+    sendbuf = (char *) OMPI_F2C_IN_PLACE(sendbuf);
     sendbuf = (char *) OMPI_F2C_BOTTOM(sendbuf);
     recvbuf = (char *) OMPI_F2C_BOTTOM(recvbuf);
 
diff --git a/ompi/mpi/fortran/mpif-h/iexscan_f.c b/ompi/mpi/fortran/mpif-h/iexscan_f.c
index 5004115318..cd41416244 100644
--- a/ompi/mpi/fortran/mpif-h/iexscan_f.c
+++ b/ompi/mpi/fortran/mpif-h/iexscan_f.c
@@ -81,7 +81,7 @@ void ompi_iexscan_f(char *sendbuf, char *recvbuf, MPI_Fint *count,
     c_type = PMPI_Type_f2c(*datatype);
     c_op = PMPI_Op_f2c(*op);
 
-    /* MPI_IN_PLACE is not supported */
+    sendbuf = (char *) OMPI_F2C_IN_PLACE(sendbuf);
     sendbuf = (char *) OMPI_F2C_BOTTOM (sendbuf);
     recvbuf = (char *) OMPI_F2C_BOTTOM (recvbuf);