diff --git a/src/client/shared/worker.ts b/src/client/shared/worker.ts
index 1578b85..f042fe1 100644
--- a/src/client/shared/worker.ts
+++ b/src/client/shared/worker.ts
@@ -1,3 +1,4 @@
+import { iswindow } from "..";
 import { BareMuxConnection } from "../../shared";
 import { encodeUrl } from "../../shared/rewriters/url";
 import type { MessageC2W } from "../../worker";
@@ -6,7 +7,7 @@ import { ScramjetClient } from "../client";
 const workerpostmessage = Worker.prototype.postMessage;
 
 export default function (client: ScramjetClient, self: typeof globalThis) {
-	client.Proxy("Worker", {
+	const handler = {
 		construct({ args, call }) {
 			if (args[0] instanceof URL) args[0] = args[0].href;
 			if (args[0].startsWith("blob:") || args[0].startsWith("data:")) {
@@ -48,57 +49,22 @@ export default function (client: ScramjetClient, self: typeof globalThis) {
 				);
 			})();
 		},
-	});
+	};
 
-	client.Proxy("Worklet.prototype.addModule", {
-		apply(ctx) {
-			if (ctx.args[0]) ctx.args[0] = encodeUrl(ctx.args[0], client.meta);
-		},
-	});
+	if (self.Worker) {
+		client.Proxy("Worker", handler);
+	}
 
-	client.Proxy("SharedWorker", {
-		construct({ args, call }) {
-			if (args[0] instanceof URL) args[0] = args[0].href;
-			if (args[0].startsWith("blob:") || args[0].startsWith("data:")) {
-				const data = syncfetch(client, args[0]);
-				const id = Math.random().toString(8).slice(5);
+	if (iswindow) {
+		client.Proxy("Worklet.prototype.addModule", {
+			apply(ctx) {
+				if (ctx.args[0]) ctx.args[0] = encodeUrl(ctx.args[0], client.meta);
+			},
+		});
 
-				args[0] = "/scramjet/worker?id=" + id;
-				if (args[1] && args[1].type === "module") {
-					args[0] += "&type=module";
-				}
-
-				args[0] += "&origin=" + encodeURIComponent(client.url.origin);
-
-				client.serviceWorker.controller?.postMessage({
-					scramjet$type: "dataworker",
-					data,
-					id,
-				} as MessageC2W);
-			} else {
-				args[0] = encodeUrl(args[0], client.meta) + "?dest=worker";
-
-				if (args[1] && args[1].type === "module") {
-					args[0] += "&type=module";
-				}
-			}
-
-			const worker = call();
-			const conn = new BareMuxConnection();
-
-			(async () => {
-				const port = await conn.getInnerPort();
-				workerpostmessage.call(
-					worker,
-					{
-						$scramjet$type: "baremuxinit",
-						port,
-					},
-					[port]
-				);
-			})();
-		},
-	});
+		// sharedworkers can only be constructed from window
+		client.Proxy("SharedWorker", handler);
+	}
 }
 
 function syncfetch(client: ScramjetClient, url: string) {