diff --git a/trunk/paradiseo-peo/src/rmc/mpi/mess.cpp b/trunk/paradiseo-peo/src/rmc/mpi/mess.cpp
index c45f94a6e..c30f56c28 100644
--- a/trunk/paradiseo-peo/src/rmc/mpi/mess.cpp
+++ b/trunk/paradiseo-peo/src/rmc/mpi/mess.cpp
@@ -341,6 +341,7 @@ void unpack (std::string & __str)
   buffer = new char[len+1];
   MPI_Unpack (mpi_buf, MPI_BUF_SIZE, & pos_buf, buffer, len, MPI_CHAR, MPI_COMM_WORLD);
   __str.assign( buffer );
+  delete [] buffer;
 
 }