diff --git a/contrib/pg_upgrade/server.c b/contrib/pg_upgrade/server.c
new file mode 100644
index 49d4c8f..01e0dd3
*** a/contrib/pg_upgrade/server.c
--- b/contrib/pg_upgrade/server.c
*************** start_postmaster(ClusterInfo *cluster)
*** 219,225 ****
  			 (cluster->controldata.cat_ver >=
  			  BINARY_UPGRADE_SERVER_FLAG_CAT_VER) ? " -b" :
  			 " -c autovacuum=off -c autovacuum_freeze_max_age=2000000000",
! 			 (cluster == &new_cluster) ? " -c synchronous_commit=off" : "",
  			 cluster->pgopts ? cluster->pgopts : "", socket_string);
  
  	/*
--- 219,225 ----
  			 (cluster->controldata.cat_ver >=
  			  BINARY_UPGRADE_SERVER_FLAG_CAT_VER) ? " -b" :
  			 " -c autovacuum=off -c autovacuum_freeze_max_age=2000000000",
! 			 (cluster == &new_cluster) ? " -c fsync=off" : "",
  			 cluster->pgopts ? cluster->pgopts : "", socket_string);
  
  	/*