diff --git a/src/library_pthread.js b/src/library_pthread.js
index 414be3e9eea27..319278909590d 100644
--- a/src/library_pthread.js
+++ b/src/library_pthread.js
@@ -447,13 +447,13 @@ var LibraryPThread = {
         var p = trustedTypes.createPolicy(
           'emscripten#workerPolicy1',
           {
-            createScriptURL: (ignored) => new URL(import.meta.url)
+            createScriptURL: (ignored) => new URL("{{{ TARGET_JS_NAME }}}", import.meta.url)
           }
         );
         worker = new Worker(p.createScriptURL('ignored'), workerOptions);
       } else
 #endif
-      worker = new Worker(new URL(import.meta.url), workerOptions);
+      worker = new Worker(new URL("{{{ TARGET_JS_NAME }}}", import.meta.url), workerOptions);
 #else
       var pthreadMainJs = _scriptName;
 #if expectToReceiveOnModule('mainScriptUrlOrBlob')
diff --git a/test/common.py b/test/common.py
index 0f4e64aa975da..0c3514241efa2 100644
--- a/test/common.py
+++ b/test/common.py
@@ -1150,7 +1150,7 @@ def add_on_exit(self, code):
   #                  libraries, for example
   def get_emcc_args(self, main_file=False, compile_only=False, asm_only=False):
     def is_ldflag(f):
-      return any(f.startswith(s) for s in ['-sEXPORT_ES6', '-sPROXY_TO_PTHREAD', '-sENVIRONMENT=', '--pre-js=', '--post-js='])
+      return any(f.startswith(s) for s in ['-sEXPORT_ES6', '-sPROXY_TO_PTHREAD', '-sENVIRONMENT=', '--pre-js=', '--post-js=', '-sPTHREAD_POOL_SIZE='])
 
     args = self.serialize_settings(compile_only or asm_only) + self.emcc_args
     if asm_only:
diff --git a/test/test_browser.py b/test/test_browser.py
index e668740a9dafb..273eea9a83f67 100644
--- a/test/test_browser.py
+++ b/test/test_browser.py
@@ -5548,13 +5548,13 @@ def test_error_reporting(self):
   def test_webpack(self, es6):
     if es6:
       shutil.copytree(test_file('webpack_es6'), 'webpack')
-      self.emcc_args += ['-sEXPORT_ES6']
+      self.emcc_args += ['-sEXPORT_ES6', '-pthread', '-sPTHREAD_POOL_SIZE=1']
       outfile = 'src/hello.mjs'
     else:
       shutil.copytree(test_file('webpack'), 'webpack')
       outfile = 'src/hello.js'
     with utils.chdir('webpack'):
-      self.compile_btest('hello_world.c', ['-sEXIT_RUNTIME', '-sMODULARIZE', '-sENVIRONMENT=web', '-o', outfile])
+      self.compile_btest('hello_world.c', ['-sEXIT_RUNTIME', '-sMODULARIZE', '-sENVIRONMENT=web,worker', '-o', outfile])
       self.run_process(shared.get_npm_cmd('webpack') + ['--mode=development', '--no-devtool'])
     shutil.copyfile('webpack/src/hello.wasm', 'webpack/dist/hello.wasm')
     self.run_browser('webpack/dist/index.html', '/report_result?exit:0')