diff --git a/apps/emqx_ldap/src/emqx_ldap.erl b/apps/emqx_ldap/src/emqx_ldap.erl
index 7fed819de..7cc9a6be0 100644
--- a/apps/emqx_ldap/src/emqx_ldap.erl
+++ b/apps/emqx_ldap/src/emqx_ldap.erl
@@ -207,7 +207,7 @@ do_ldap_query(
                 #{result => Result}
             ),
             {ok, Result#eldap_search_result.entries};
-        {error, noSuchObject} ->
+        {error, 'noSuchObject'} ->
             {ok, []};
         {error, Reason} ->
             ?SLOG(