diff --git a/index.js b/index.js
index 8c106e7..92191b6 100644
--- a/index.js
+++ b/index.js
@@ -1,10 +1,9 @@
-import process from "node:process";
-
 export const isBun = globalThis.Bun !== undefined;
 
 export const isDeno = globalThis.Deno !== undefined;
 
-export const isNode = process.versions?.node !== undefined && !isBun && !isDeno;
+export const isNode =
+  globalThis.process?.versions?.node !== undefined && !isBun && !isDeno;
 
 export const isEdgeLight =
   globalThis.EdgeRuntime === undefined
diff --git a/regression.test.js b/regression.test.js
new file mode 100644
index 0000000..78f3136
--- /dev/null
+++ b/regression.test.js
@@ -0,0 +1,46 @@
+import { execFile } from "node:child_process";
+import process from "node:process";
+import { promisify } from "node:util";
+import test from "ava";
+
+const execute = promisify(execFile);
+
+test("loads the unmodified module in runtimes without Node built-ins", async (t) => {
+  const script = `
+    import {readFile} from 'node:fs/promises';
+    import {createContext, SourceTextModule} from 'node:vm';
+    const source = await readFile(new URL(${JSON.stringify(new URL("./index.js", import.meta.url).href)}), 'utf8');
+    const environments = [
+      {window: {}, document: {}},
+      {EdgeRuntime: 'edge-runtime'},
+      {caches: {}, HTMLRewriter: class {}},
+      {Bun: {}},
+      {Deno: {}},
+      {},
+      {process: {versions: {node: '22.0.0'}}},
+    ];
+    const results = [];
+    for (const globals of environments) {
+      const module = new SourceTextModule(source, {context: createContext(globals)});
+      await module.link((specifier) => {throw new Error('Unavailable built-in: ' + specifier);});
+      await module.evaluate();
+      results.push(module.namespace.default());
+    }
+    console.log(JSON.stringify(results));
+  `;
+  const { stdout } = await execute(process.execPath, [
+    "--experimental-vm-modules",
+    "--input-type=module",
+    "--eval",
+    script,
+  ]);
+  t.deepEqual(JSON.parse(stdout), [
+    "browser",
+    "edge-light",
+    "cloudflare-workers",
+    "bun",
+    "deno",
+    "unknown",
+    "node",
+  ]);
+});