diff --git a/src/include/mpi.h.in b/src/include/mpi.h.in
index 1180c3f17a1..3e28e5307db 100644
--- a/src/include/mpi.h.in
+++ b/src/include/mpi.h.in
@@ -77,6 +77,24 @@
 #define MPICH_CALC_VERSION(MAJOR, MINOR, REVISION, TYPE, PATCH) \
     (((MAJOR) * 10000000) + ((MINOR) * 100000) + ((REVISION) * 1000) + ((TYPE) * 100) + (PATCH))
 
+#if !defined(INT8_C)
+/* stdint.h was not included, see if we can get it */
+#  if defined(__cplusplus)
+#    if __cplusplus >= 201103
+#      include <cstdint>
+#    endif
+#  endif
+#endif
+
+#if !defined(INT8_C)
+/* stdint.h was not included, see if we can get it */
+#  if defined(__STDC_VERSION__)
+#    if __STDC_VERSION__ >= 199901
+#      include <stdint.h>
+#    endif
+#  endif
+#endif
+
 /* Keep C++ compilers from getting confused */
 #if defined(__cplusplus)
 extern "C" {
@@ -105,24 +123,6 @@ extern "C" {
 #  define MPICH_ATTR_TYPE_TAG_MUST_BE_NULL()
 #endif
 
-#if !defined(INT8_C)
-/* stdint.h was not included, see if we can get it */
-#  if defined(__cplusplus)
-#    if __cplusplus >= 201103
-#      include <cstdint>
-#    endif
-#  endif
-#endif
-
-#if !defined(INT8_C)
-/* stdint.h was not included, see if we can get it */
-#  if defined(__STDC_VERSION__)
-#    if __STDC_VERSION__ >= 199901
-#      include <stdint.h>
-#    endif
-#  endif
-#endif
-
 #if defined(INT8_C)
 /* stdint.h was included, so we can annotate these types */
 #  define MPICH_ATTR_TYPE_TAG_STDINT(type) MPICH_ATTR_TYPE_TAG(type)
@@ -1028,6 +1028,56 @@ typedef struct MPIX_Iov {
 #include <mpi_proto.h>
 
 @HAVE_ROMIO@
+
+/* The f2c and c2f APIs exist as real functions, but these macros allows
+ * for backward MPICH ABI compatibility.
+ */
+/* exclude these macros from MPICH internal */
+#ifndef MPICHCONF_H_INCLUDED
+#define MPI_Comm_c2f(comm) (MPI_Fint)(comm)
+#define MPI_Comm_f2c(comm) (MPI_Comm)(comm)
+#define MPI_Type_c2f(datatype) (MPI_Fint)(datatype)
+#define MPI_Type_f2c(datatype) (MPI_Datatype)(datatype)
+#define MPI_Group_c2f(group) (MPI_Fint)(group)
+#define MPI_Group_f2c(group) (MPI_Group)(group)
+#define MPI_Info_c2f(info) (MPI_Fint)(info)
+#define MPI_Info_f2c(info) (MPI_Info)(info)
+#define MPI_Request_f2c(request) (MPI_Request)(request)
+#define MPI_Request_c2f(request) (MPI_Fint)(request)
+#define MPI_Op_c2f(op) (MPI_Fint)(op)
+#define MPI_Op_f2c(op) (MPI_Op)(op)
+#define MPI_Errhandler_c2f(errhandler) (MPI_Fint)(errhandler)
+#define MPI_Errhandler_f2c(errhandler) (MPI_Errhandler)(errhandler)
+#define MPI_Win_c2f(win)   (MPI_Fint)(win)
+#define MPI_Win_f2c(win)   (MPI_Win)(win)
+#define MPI_Message_c2f(msg) ((MPI_Fint)(msg))
+#define MPI_Message_f2c(msg) ((MPI_Message)(msg))
+#define MPI_Session_c2f(session) (MPI_Fint)(session)
+#define MPI_Session_f2c(session) (MPI_Session)(session)
+
+/* PMPI versions of the handle transfer functions.  See section 4.17 */
+#define PMPI_Comm_c2f(comm) (MPI_Fint)(comm)
+#define PMPI_Comm_f2c(comm) (MPI_Comm)(comm)
+#define PMPI_Type_c2f(datatype) (MPI_Fint)(datatype)
+#define PMPI_Type_f2c(datatype) (MPI_Datatype)(datatype)
+#define PMPI_Group_c2f(group) (MPI_Fint)(group)
+#define PMPI_Group_f2c(group) (MPI_Group)(group)
+#define PMPI_Info_c2f(info) (MPI_Fint)(info)
+#define PMPI_Info_f2c(info) (MPI_Info)(info)
+#define PMPI_Request_f2c(request) (MPI_Request)(request)
+#define PMPI_Request_c2f(request) (MPI_Fint)(request)
+#define PMPI_Op_c2f(op) (MPI_Fint)(op)
+#define PMPI_Op_f2c(op) (MPI_Op)(op)
+#define PMPI_Errhandler_c2f(errhandler) (MPI_Fint)(errhandler)
+#define PMPI_Errhandler_f2c(errhandler) (MPI_Errhandler)(errhandler)
+#define PMPI_Win_c2f(win)   (MPI_Fint)(win)
+#define PMPI_Win_f2c(win)   (MPI_Win)(win)
+#define PMPI_Message_c2f(msg) ((MPI_Fint)(msg))
+#define PMPI_Message_f2c(msg) ((MPI_Message)(msg))
+#define PMPI_Session_c2f(session) (MPI_Fint)(session)
+#define PMPI_Session_f2c(session) (MPI_Session)(session)
+#endif
+
 #endif /* BUILD_MPI_ABI */
 
 #if defined(__cplusplus)