diff --git a/src/lib.rs b/src/lib.rs
index 925f6778d4d..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> {
@@ -43,5 +47,5 @@ fn on_start() {
 
 #[wasm_bindgen(js_name = setWorkerUrl)]
 pub fn set_worker_url(url: js_sys::JsString) {
-    crate::utils::set_worker_url(url);
+    *CUSTOM_WORKER_URL.lock().unwrap() = Some(url.into());
 }
diff --git a/src/tasks/worker_handle.rs b/src/tasks/worker_handle.rs
index 198aaf1a930..e429f35b641 100644
--- a/src/tasks/worker_handle.rs
+++ b/src/tasks/worker_handle.rs
@@ -148,24 +148,13 @@ static WORKER_URL: Lazy<String> = Lazy::new(|| {
     extern "C" {
         #[wasm_bindgen(js_namespace = ["import", "meta"], js_name = url)]
         static IMPORT_META_URL: String;
-
-        #[wasm_bindgen(js_namespace = ["globalThis"], js_name = customWorkerUrl)]
-        static CUSTOM_WORKER_URL: Option<String>;
-
     }
 
-    tracing::trace!(import_url = IMPORT_META_URL.as_str());
-    tracing::trace!(
-        custom_worker_url = CUSTOM_WORKER_URL
-            .as_ref()
-            .unwrap_or(&"".to_string())
-            .as_str()
-    );
-    let import_url: String = CUSTOM_WORKER_URL
-        .to_owned()
-        .unwrap_or(IMPORT_META_URL.to_string());
+    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("$IMPORT_META_URL", &import_url);
+    let script = include_str!("worker.js").replace("$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(),
diff --git a/src/utils.rs b/src/utils.rs
index a925ab9b0db..38cd4814e03 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -4,7 +4,7 @@ use std::{
     num::NonZeroUsize,
 };
 
-use js_sys::{global, JsString, Promise};
+use js_sys::{JsString, Promise};
 
 use wasm_bindgen::{JsCast, JsValue};
 use web_sys::{Window, WorkerGlobalScope};
@@ -252,8 +252,3 @@ pub(crate) fn js_record_of_strings(obj: &js_sys::Object) -> Result<Vec<(String,
 
     Ok(parsed)
 }
-
-pub(crate) fn set_worker_url(url: JsString) {
-    js_sys::Reflect::set(&global(), &JsString::from("customWorkerUrl"), &url)
-        .expect("Can't set worker url in the global JS scope");
-}