diff --git a/src/emqx_relup.erl b/src/emqx_relup.erl
index 33501b8cf..b5290963c 100644
--- a/src/emqx_relup.erl
+++ b/src/emqx_relup.erl
@@ -124,6 +124,7 @@ maybe_start_schema_registry(_) ->
     ok.
 -endif.
 
+-compile([{nowarn_unused_function, [{do_when_vsn_lte, 4}]}]).
 do_when_vsn_lte(SrcVsnStr, TargetVsn, ActionName, Action) ->
     try
         case list_to_integer(SrcVsnStr) of