diff --git a/ompi/include/mpi.h.in b/ompi/include/mpi.h.in
index 7b972599c9..bf572634ed 100644
--- a/ompi/include/mpi.h.in
+++ b/ompi/include/mpi.h.in
@@ -149,9 +149,6 @@
 /* Type of MPI_Count */
 #undef OMPI_MPI_COUNT_TYPE
 
-/* Size of MPI_Count */
-#undef OMPI_MPI_COUNT_SIZE
-
 /* type to use for ptrdiff_t, if it does not exist, set to ptrdiff_t if it does exist */
 #undef OPAL_PTRDIFF_TYPE