1 files changed, 2 insertions, 0 deletions
diff --git a/cli/js/runtime_main.ts b/cli/js/runtime_main.ts
index 58405f673..25a6b0f93 100644
--- a/cli/js/runtime_main.ts
+++ b/cli/js/runtime_main.ts
@@ -9,6 +9,7 @@
 
 import * as denoNs from "./deno.ts";
 import * as denoUnstableNs from "./deno_unstable.ts";
+import { opMainModule } from "./ops/runtime.ts";
 import { exit } from "./ops/os.ts";
 import {
   readOnly,
@@ -106,6 +107,7 @@ export function bootstrapMainRuntime(): void {
   if (unstableFlag) {
     Object.defineProperties(globalThis, unstableMethods);
     Object.defineProperties(globalThis, unstableProperties);
+    Object.defineProperty(denoNs, "mainModule", getterOnly(opMainModule));
     Object.assign(denoNs, denoUnstableNs);
   }