diff --git a/src/idom/backend/sanic.py b/src/idom/backend/sanic.py
index bb3397e74..537ed839f 100644
--- a/src/idom/backend/sanic.py
+++ b/src/idom/backend/sanic.py
@@ -154,7 +154,10 @@ async def web_module_files(
             _: str = "",  # this is not used
         ) -> response.HTTPResponse:
             path = urllib_parse.unquote(path)
-            return await response.file(safe_web_modules_dir_path(path))
+            return await response.file(
+                safe_web_modules_dir_path(path),
+                mime_type="text/javascript",
+            )
 
         blueprint.add_route(web_module_files, "/_api/modules/<path:path>")
         blueprint.add_route(web_module_files, "/<_:path>/_api/modules/<path:path>")
diff --git a/src/idom/backend/starlette.py b/src/idom/backend/starlette.py
index 5b78c8111..d4013e605 100644
--- a/src/idom/backend/starlette.py
+++ b/src/idom/backend/starlette.py
@@ -126,7 +126,7 @@ def _setup_common_routes(options: Options, app: Starlette) -> None:
 
     if options.serve_static_files:
         wm_dir = IDOM_WEB_MODULES_DIR.current
-        web_module_files = StaticFiles(directory=wm_dir, html=True, check_dir=False)
+        web_module_files = StaticFiles(directory=wm_dir, check_dir=False)
         app.mount(url_prefix + "/_api/modules", web_module_files)
         app.mount(url_prefix + "/{_:path}/_api/modules", web_module_files)