diff --git a/lib/communicator/SharedMemoryMPI.cc b/lib/communicator/SharedMemoryMPI.cc
index 8eebdc0f..d534a6d9 100644
--- a/lib/communicator/SharedMemoryMPI.cc
+++ b/lib/communicator/SharedMemoryMPI.cc
@@ -325,7 +325,8 @@ void GlobalSharedMemory::SharedMemoryAllocate(uint64_t bytes, int flags)
 
       size_t size = bytes ;
       
-      sprintf(shm_name,"/Grid_mpi3_shm_%d_%d",WorldNode,r);
+      struct passwd *pw = getpwuid (getuid());
+      sprintf(shm_name,"/Grid_%s_mpi3_shm_%d_%d",pw->pw_name,WorldNode,r);
       
       int fd=shm_open(shm_name,O_RDWR,0666);
       if ( fd<0 ) {	perror("failed shm_open");	assert(0);      }