diff --git a/ocaml/xapi-storage-script/main.ml b/ocaml/xapi-storage-script/main.ml
index a0b99ae91a..e29f4937ab 100644
--- a/ocaml/xapi-storage-script/main.ml
+++ b/ocaml/xapi-storage-script/main.ml
@@ -1796,7 +1796,7 @@ let rec diff a b =
 
 (* default false due to bugs in SMAPIv3 plugins,
    once they are fixed this should be set to true *)
-let concurrent = ref false
+let concurrent = ref true
 
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