diff --git a/apps/emqx_management/src/emqx_mgmt.erl b/apps/emqx_management/src/emqx_mgmt.erl
index f82b881a8..d45b5ad77 100644
--- a/apps/emqx_management/src/emqx_mgmt.erl
+++ b/apps/emqx_management/src/emqx_mgmt.erl
@@ -149,7 +149,7 @@ node_info(Node) when Node =:= node() ->
     Info#{node              => node(),
           otp_release       => iolist_to_binary(otp_rel()),
           memory_total      => proplists:get_value(allocated, Memory),
-          memory_used       => proplists:get_value(total, Memory),
+          memory_used       => proplists:get_value(used, Memory),
           process_available => erlang:system_info(process_limit),
           process_used      => erlang:system_info(process_count),
 
@@ -650,4 +650,3 @@ max_row_limit() ->
     ?MAX_ROW_LIMIT.
 
 table_size(Tab) -> ets:info(Tab, size).
-