diff --git a/cli/dts/lib.deno.ns.d.ts b/cli/dts/lib.deno.ns.d.ts
index f551ea361e..5cb0f432b4 100644
--- a/cli/dts/lib.deno.ns.d.ts
+++ b/cli/dts/lib.deno.ns.d.ts
@@ -2025,4 +2025,7 @@ declare namespace Deno {
    * called when `Deno.inspect()` is called, or when the object is logged to
    * the console. */
   export const customInspect: unique symbol;
+
+  /** The URL of the entrypoint module entered from the command-line. */
+  export const mainModule: string;
 }
diff --git a/cli/dts/lib.deno.unstable.d.ts b/cli/dts/lib.deno.unstable.d.ts
index a7203f778c..8a3e872dfa 100644
--- a/cli/dts/lib.deno.unstable.d.ts
+++ b/cli/dts/lib.deno.unstable.d.ts
@@ -1098,9 +1098,6 @@ declare namespace Deno {
    */
   export function hostname(): string;
 
-  /** **UNSTABLE**: The URL of the file that was originally executed from the command-line. */
-  export const mainModule: string;
-
   /** **UNSTABLE**: new API, yet to be vetted.
    * Synchronously truncates or extends the specified file stream, to reach the
    * specified `len`.  If `len` is not specified then the entire file contents
@@ -1217,7 +1214,7 @@ declare namespace Deno {
 
   /** **UNSTABLE**: New API, yet to be vetted.
    * A custom HttpClient for use with `fetch`.
-   * 
+   *
    * ```ts
    * const client = new Deno.createHttpClient({ caFile: "./ca.pem" });
    * const req = await fetch("https://myserver.com", { client });
@@ -1233,7 +1230,7 @@ declare namespace Deno {
    */
   interface CreateHttpClientOptions {
     /** A certificate authority to use when validating TLS certificates.
-     * 
+     *
      * Requires `allow-read` permission.
      */
     caFile?: string;
@@ -1241,7 +1238,7 @@ declare namespace Deno {
 
   /** **UNSTABLE**: New API, yet to be vetted.
    * Create a custom HttpClient for to use with `fetch`.
-   * 
+   *
    * ```ts
    * const client = new Deno.createHttpClient({ caFile: "./ca.pem" });
    * const req = await fetch("https://myserver.com", { client });
diff --git a/cli/ops/runtime.rs b/cli/ops/runtime.rs
index 1e426ad8ae..55f0d9f576 100644
--- a/cli/ops/runtime.rs
+++ b/cli/ops/runtime.rs
@@ -53,7 +53,6 @@ fn op_main_module(
     let main_path = std::env::current_dir().unwrap().join(main_url.to_string());
     state.check_read_blind(&main_path, "main_module")?;
   }
-  state.check_unstable("Deno.mainModule");
   Ok(JsonOp::Sync(json!(&main)))
 }
 
diff --git a/cli/rt/99_main.js b/cli/rt/99_main.js
index 873e422915..a28eef8061 100644
--- a/cli/rt/99_main.js
+++ b/cli/rt/99_main.js
@@ -328,14 +328,10 @@ delete Object.prototype.__proto__;
       ppid: util.readOnly(ppid),
       noColor: util.readOnly(noColor),
       args: util.readOnly(Object.freeze(args)),
+      mainModule: util.getterOnly(opMainModule),
     });
 
     if (unstableFlag) {
-      Object.defineProperty(
-        finalDenoNs,
-        "mainModule",
-        util.getterOnly(opMainModule),
-      );
       Object.assign(finalDenoNs, denoNsUnstable);
     }
 
diff --git a/cli/tests/integration_tests.rs b/cli/tests/integration_tests.rs
index c4544669ff..e8e8828ccc 100644
--- a/cli/tests/integration_tests.rs
+++ b/cli/tests/integration_tests.rs
@@ -1925,7 +1925,7 @@ itest!(import_meta {
 });
 
 itest!(main_module {
-  args: "run --quiet --unstable --allow-read --reload main_module.ts",
+  args: "run --quiet --allow-read --reload main_module.ts",
   output: "main_module.ts.out",
 });
 
diff --git a/cli/tsc/99_main_compiler.js b/cli/tsc/99_main_compiler.js
index 23e25237a1..f3dde7b1fd 100644
--- a/cli/tsc/99_main_compiler.js
+++ b/cli/tsc/99_main_compiler.js
@@ -101,7 +101,6 @@ delete Object.prototype.__proto__;
     "PermissionStatus",
     "hostname",
     "ppid",
-    "mainModule",
     "ftruncate",
     "ftruncateSync",
     "fdatasync",