diff --git a/bin/builder_db_app.ml b/bin/builder_db_app.ml
index b5cfb01..e04699d 100644
--- a/bin/builder_db_app.ml
+++ b/bin/builder_db_app.ml
@@ -411,7 +411,7 @@ let datadir =
   let doc = "data directory" in
   Cmdliner.Arg.(value &
                 opt dir Builder_system.default_datadir &
-                info ~doc ["datadir"])
+                info ~doc ["datadir"; "d"])
 
 let jobname =
   let doc = "jobname" in
diff --git a/bin/migrations/builder_migrations.ml b/bin/migrations/builder_migrations.ml
index e1b713d..49aec0e 100644
--- a/bin/migrations/builder_migrations.ml
+++ b/bin/migrations/builder_migrations.ml
@@ -63,7 +63,7 @@ let datadir =
   let doc = "data directory containing builder.sqlite3 and data files" in
   Cmdliner.Arg.(value &
                 opt dir Builder_system.default_datadir &
-                info ~doc ["datadir"])
+                info ~doc ["datadir"; "d"])
 
 let setup_log =
   let setup_log level =