diff --git a/docs/doc_gen/rpcs/rpc_doc.ml b/docs/doc_gen/rpcs/rpc_doc.ml
index bd9ae3a2c..ec5929373 100644
--- a/docs/doc_gen/rpcs/rpc_doc.ml
+++ b/docs/doc_gen/rpcs/rpc_doc.ml
@@ -301,7 +301,10 @@ let pp_print_html_tabs fmt { path ; description ; input ; output ; _ (* example
    | Some _ ->
        fprintf fmt "%a" (pp_print_html_tab_button ~default:false ~shortlabel:"input" ~content:"Input format") path;
    | None -> ());
-  fprintf fmt "%a" (pp_print_html_tab_button ~default:false ~shortlabel:"output" ~content:"Output format") path;
+  (match output with
+   | Some _ ->
+       fprintf fmt "%a" (pp_print_html_tab_button ~default:false ~shortlabel:"output" ~content:"Output format") path;
+   | None -> ());
   (* (match example with
    *  | Some _ ->
    *      fprintf fmt "%a" (pp_print_html_tab_button ~default:false ~shortlabel:"example" ~content:"Example") path;