diff --git a/cli/tests/testdata/workers/test.ts b/cli/tests/testdata/workers/test.ts
index 1c345f80b7..43df417fb3 100644
--- a/cli/tests/testdata/workers/test.ts
+++ b/cli/tests/testdata/workers/test.ts
@@ -798,3 +798,32 @@ Deno.test({
     worker.terminate();
   },
 });
+
+Deno.test({
+  name: "worker Deno.memoryUsage",
+  fn: async function () {
+    const w = new Worker(
+      /**
+       * Source code
+       * self.onmessage = function() {self.postMessage(Deno.memoryUsage())}
+       */
+      "data:application/typescript;base64,c2VsZi5vbm1lc3NhZ2UgPSBmdW5jdGlvbigpIHtzZWxmLnBvc3RNZXNzYWdlKERlbm8ubWVtb3J5VXNhZ2UoKSl9",
+      { type: "module", name: "tsWorker", deno: true },
+    );
+
+    w.postMessage(null);
+
+    const memoryUsagePromise = deferred();
+    w.onmessage = function (evt) {
+      memoryUsagePromise.resolve(evt.data);
+    };
+
+    assertEquals(
+      Object.keys(
+        await memoryUsagePromise as unknown as Record<string, number>,
+      ),
+      ["rss", "heapTotal", "heapUsed", "external"],
+    );
+    w.terminate();
+  },
+});
diff --git a/runtime/js/90_deno_ns.js b/runtime/js/90_deno_ns.js
index b19f6d5752..f7f5184272 100644
--- a/runtime/js/90_deno_ns.js
+++ b/runtime/js/90_deno_ns.js
@@ -29,6 +29,7 @@
     makeTempDir: __bootstrap.fs.makeTempDir,
     makeTempFileSync: __bootstrap.fs.makeTempFileSync,
     makeTempFile: __bootstrap.fs.makeTempFile,
+    memoryUsage: core.memoryUsage,
     mkdirSync: __bootstrap.fs.mkdirSync,
     mkdir: __bootstrap.fs.mkdir,
     chdir: __bootstrap.fs.chdir,
diff --git a/runtime/js/99_main.js b/runtime/js/99_main.js
index 190ff24da5..3a56d93dc4 100644
--- a/runtime/js/99_main.js
+++ b/runtime/js/99_main.js
@@ -588,7 +588,6 @@ delete Object.prototype.__proto__;
       [internalSymbol]: internals,
       resources: core.resources,
       close: core.close,
-      memoryUsage: core.memoryUsage,
       ...denoNs,
     };
     ObjectDefineProperties(finalDenoNs, {