diff --git a/src/lib.rs b/src/lib.rs
index 4d4d88c287d..dbc9cd580af 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -16,6 +16,8 @@ mod tasks;
 mod utils;
 mod ws;
 
+use std::sync::Mutex;
+
 pub use crate::{
     container::{Container, Manifest, Volume},
     facade::{SpawnConfig, Wasmer, WasmerConfig},
@@ -25,10 +27,12 @@ pub use crate::{
     runtime::Runtime,
 };
 
+use once_cell::sync::Lazy;
 use wasm_bindgen::prelude::wasm_bindgen;
 
 pub(crate) const USER_AGENT: &str = concat!(env!("CARGO_PKG_NAME"), "/", env!("CARGO_PKG_VERSION"));
 pub(crate) const DEFAULT_RUST_LOG: &[&str] = &["warn"];
+pub(crate) static CUSTOM_WORKER_URL: Lazy<Mutex<Option<String>>> = Lazy::new(Mutex::default);
 
 #[wasm_bindgen]
 pub fn wat2wasm(wat: String) -> Result<js_sys::Uint8Array, utils::Error> {
@@ -40,3 +44,8 @@ pub fn wat2wasm(wat: String) -> Result<js_sys::Uint8Array, utils::Error> {
 fn on_start() {
     console_error_panic_hook::set_once();
 }
+
+#[wasm_bindgen(js_name = setWorkerUrl)]
+pub fn set_worker_url(url: js_sys::JsString) {
+    *CUSTOM_WORKER_URL.lock().unwrap() = Some(url.into());
+}
diff --git a/src/tasks/worker.js b/src/tasks/worker.js
index ee3c4550642..c3de472984d 100644
--- a/src/tasks/worker.js
+++ b/src/tasks/worker.js
@@ -15,7 +15,7 @@ let handleMessage = async data => {
 globalThis.onmessage = async ev => {
     if (ev.data.type == "init") {
         const { memory, module, id } = ev.data;
-        const imported = await import("$IMPORT_META_URL");
+        const imported = await import(new URL("$IMPORT_META_URL", self.location.origin));
 
         // HACK: How we load our imports will change depending on how the code
         // is deployed. If we are being used in "wasm-pack test" then we can
diff --git a/src/tasks/worker_handle.rs b/src/tasks/worker_handle.rs
index d154c0ca80a..e429f35b641 100644
--- a/src/tasks/worker_handle.rs
+++ b/src/tasks/worker_handle.rs
@@ -150,9 +150,11 @@ static WORKER_URL: Lazy<String> = Lazy::new(|| {
         static IMPORT_META_URL: String;
     }
 
-    tracing::trace!(import_url = IMPORT_META_URL.as_str());
+    let import_url = crate::CUSTOM_WORKER_URL.lock().unwrap();
+    let import_url = import_url.as_deref().unwrap_or(IMPORT_META_URL.as_str());
+    tracing::trace!(import_url);
 
-    let script = include_str!("worker.js").replace("$IMPORT_META_URL", &IMPORT_META_URL);
+    let script = include_str!("worker.js").replace("$IMPORT_META_URL", import_url);
 
     let blob = web_sys::Blob::new_with_u8_array_sequence_and_options(
         Array::from_iter([Uint8Array::from(script.as_bytes())]).as_ref(),