1 files changed, 1 insertions, 1 deletions

diff --git a/lib/mpi/mpi-internal.h b/lib/mpi/mpi-internal.h
index 60cf765628e9..c65dd1bff45a 100644
--- a/lib/mpi/mpi-internal.h
+++ b/lib/mpi/mpi-internal.h
@@ -84,7 +84,7 @@ static inline int RESIZE_IF_NEEDED(MPI a, unsigned b)
         do {                                    \
                 mpi_size_t _i;                  \
                 for (_i = 0; _i < (n); _i++)    \
-                        (d)[_i] = (d)[_i];      \
+                        (d)[_i] = (s)[_i];      \
         } while (0)
 
 #define MPN_COPY_DECR(d, s, n) \