diff --git a/src/library_pthread.js b/src/library_pthread.js
index 864bd7eeabed..794852e0c96e 100644
--- a/src/library_pthread.js
+++ b/src/library_pthread.js
@@ -452,10 +452,10 @@ var LibraryPThread = {
               createScriptURL: (ignored) => new URL('{{{ PTHREAD_WORKER_FILE }}}', import.meta.url);
             }
           );
-          worker = new Worker(p.createScriptURL('ignored'));
+          worker = new Worker(p.createScriptURL('ignored'), {type: 'module'});
         } else
 #endif
-        worker = new Worker(new URL('{{{ PTHREAD_WORKER_FILE }}}', import.meta.url));
+        worker = new Worker(new URL('{{{ PTHREAD_WORKER_FILE }}}', import.meta.url), {type: 'module'});
       } else {
 #endif
       // Allow HTML module to configure the location where the 'worker.js' file will be loaded from,
@@ -568,7 +568,7 @@ var LibraryPThread = {
     // Called when a thread needs to be strongly referenced.
     // Currently only used for:
     // - keeping the "main" thread alive in PROXY_TO_PTHREAD mode;
-    // - crashed threads that needs to propagate the uncaught exception 
+    // - crashed threads that needs to propagate the uncaught exception
     //   back to the main thread.
 #if ENVIRONMENT_MAY_BE_NODE
     if (ENVIRONMENT_IS_NODE) {
diff --git a/test/test_other.py b/test/test_other.py
index 6f88b545343b..376b72434061 100644
--- a/test/test_other.py
+++ b/test/test_other.py
@@ -303,7 +303,7 @@ def test_emcc_output_worker_mjs(self, args):
                       test_file('hello_world.c')] + args)
     src = read_file('subdir/hello_world.mjs')
     self.assertContained("new URL('hello_world.wasm', import.meta.url)", src)
-    self.assertContained("new Worker(new URL('hello_world.worker.js', import.meta.url))", src)
+    self.assertContained("new Worker(new URL('hello_world.worker.js', import.meta.url), {type: 'module'})", src)
     self.assertContained('export default Module;', src)
     src = read_file('subdir/hello_world.worker.js')
     self.assertContained("import('./hello_world.mjs')", src)
@@ -317,7 +317,7 @@ def test_emcc_output_worker_mjs_single_file(self):
                       test_file('hello_world.c'), '-sSINGLE_FILE'])
     src = read_file('hello_world.mjs')
     self.assertNotContained("new URL('data:", src)
-    self.assertContained("new Worker(new URL('hello_world.worker.js', import.meta.url))", src)
+    self.assertContained("new Worker(new URL('hello_world.worker.js', import.meta.url), {type: 'module'})", src)
     self.assertContained('hello, world!', self.run_js('hello_world.mjs'))
 
   def test_emcc_output_mjs_closure(self):