diff --git a/docs/linking_to_external_code/import_maps.md b/docs/linking_to_external_code/import_maps.md
index 7ec963d398..567adf1580 100644
--- a/docs/linking_to_external_code/import_maps.md
+++ b/docs/linking_to_external_code/import_maps.md
@@ -38,5 +38,5 @@ for await (const req of serve(":8000")) {
 ```
 
 ```shell
-$ deno run --importmap=import_map.json hello_server.ts
+$ deno run --importmap=import_map.json --unstable hello_server.ts
 ```