diff --git a/emcc.py b/emcc.py
index 66e58c65bfcae..e55c0a24d8294 100755
--- a/emcc.py
+++ b/emcc.py
@@ -2991,7 +2991,9 @@ def modularize():
       # after document.currentScript is gone, so we save it.
       # (when MODULARIZE_INSTANCE, an instance is created
       # immediately anyhow, like in non-modularize mode)
-      if shared.Settings.EXPORT_ES6:
+      # In EXPORT_ES6 + USE_PTHREADS the 'thread' is actually an ES6 module webworker running in strict mode,
+      # so doesn't have access to 'document'. In this case use 'import.meta' instead.
+      if shared.Settings.EXPORT_ES6 and shared.Settings.USE_PTHREADS:
         script_url = "import.meta.url"
       else:
         script_url = "typeof document !== 'undefined' && document.currentScript ? document.currentScript.src : undefined"
diff --git a/src/shell.js b/src/shell.js
index d7c17226ab3b1..0e25079035d7b 100644
--- a/src/shell.js
+++ b/src/shell.js
@@ -89,8 +89,12 @@ if (Module['ENVIRONMENT']) {
 #if USE_PTHREADS && (!MODULARIZE || MODULARIZE_INSTANCE)
 // In MODULARIZE mode _scriptDir needs to be captured already at the very top of the page immediately when the page is parsed, so it is generated there
 // before the page load. In non-MODULARIZE modes generate it here.
+#if EXPORT_ES6
+var _scriptDir = import.meta.url;
+#else
 var _scriptDir = (typeof document !== 'undefined' && document.currentScript) ? document.currentScript.src : undefined;
 #endif
+#endif
 
 // `/` should be present at the end if `scriptDirectory` is not empty
 var scriptDirectory = '';