diff --git a/ompi/datatype/convertor.c b/ompi/datatype/convertor.c
index 2243967fe3..4fc879f96f 100644
--- a/ompi/datatype/convertor.c
+++ b/ompi/datatype/convertor.c
@@ -91,6 +91,7 @@ inline int32_t ompi_convertor_pack( ompi_convertor_t* pConv,
                                     struct iovec* iov, uint32_t* out_size,
                                     size_t* max_data, int32_t* freeAfter )
 {
+    pConv->checksum = 0;
     /* protect against over packing data */
     if( pConv->bConverted == (pConv->pDesc->size * pConv->count) ) {
         iov[0].iov_len = 0;
@@ -112,6 +113,7 @@ inline int32_t ompi_convertor_unpack( ompi_convertor_t* pConv,
 {
     const ompi_datatype_t *pData = pConv->pDesc;
 
+    pConv->checksum = 0;
     /* protect against over unpacking data */
     if( pConv->bConverted == (pData->size * pConv->count) ) {
         iov[0].iov_len = 0;
@@ -176,7 +178,8 @@ int ompi_convertor_create_stack_with_pos_contig( ompi_convertor_t* pConvertor,
 }
 
 static inline
-int ompi_convertor_create_stack_at_begining( ompi_convertor_t* pConvertor, const int* sizes )
+int ompi_convertor_create_stack_at_begining( ompi_convertor_t* pConvertor,
+                                             const int* sizes )
 {
     dt_stack_t* pStack = pConvertor->pStack;
     dt_elem_desc_t* pElems;
diff --git a/ompi/datatype/convertor.h b/ompi/datatype/convertor.h
index 37c9915463..4c93b662c2 100644
--- a/ompi/datatype/convertor.h
+++ b/ompi/datatype/convertor.h
@@ -52,6 +52,7 @@ struct ompi_datatype_t;
 #define CONVERTOR_STATE_COMPLETE   0x02000000
 #define CONVERTOR_STATE_ALLOC      0x04000000
 #define CONVERTOR_COMPLETED        0x08000000
+#define CONVERTOR_COMPUTE_CRC      0x10000000
 
 typedef int32_t (*conversion_fct_t)( uint32_t count,
                                      const void* from, uint32_t from_len, long from_extent,
@@ -92,6 +93,7 @@ struct ompi_convertor_t {
     /* All others fields get modified for every call to pack/unpack functions */
     uint32_t                      stack_pos;    /**< the actual position on the stack */
     size_t                        bConverted;   /**< # of bytes already converted */
+    uint32_t                      checksum;     /**< checksum computed by pack/unpack operation */
     char                          pending[16];  /**< bytes pending from the last conversion */
     uint32_t                      pending_length; /**< # bytes pending ... */
     dt_stack_t                    static_stack[DT_STATIC_STACK_SIZE];  /**< local stack for small datatypes */
@@ -105,6 +107,15 @@ OMPI_DECLSPEC extern uint32_t          ompi_mpi_local_arch;
 
 extern conversion_fct_t ompi_ddt_copy_functions[];
 
+/*
+ *
+ */
+static inline uint32_t
+ompi_convertor_get_checksum( ompi_convertor_t* convertor )
+{
+    return convertor->checksum;
+}
+
 /*
  *
  */