diff --git a/src/fs/filesystem.ts b/src/fs/filesystem.ts
index 8bd3406..4fd18aa 100644
--- a/src/fs/filesystem.ts
+++ b/src/fs/filesystem.ts
@@ -15,10 +15,6 @@ export const getParentDir = (path: string) => {
   return d === '' ? (path.startsWith('/') ? '/' : '.') : d;
 } 
 
-export function readDirAsArray(fs: FS, path: string): Promise<string[] | undefined> {
-  return new Promise((res, rej) => fs.readdir(path, (err, files) => err ? rej(err) : res(files)));
-}
-
 export function join(a: string, b: string): string {
   if (a === '.') return b;
   if (a.endsWith('/')) return join(a.substring(0, a.length - 1), b);
diff --git a/src/language/openscad-completions.ts b/src/language/openscad-completions.ts
index 2951b63..1e84085 100644
--- a/src/language/openscad-completions.ts
+++ b/src/language/openscad-completions.ts
@@ -1,7 +1,7 @@
 // Portions of this file are Copyright 2021 Google LLC, and licensed under GPL2+. See COPYING.
 
 import * as monaco from 'monaco-editor/esm/vs/editor/editor.api';
-import { join, readDirAsArray, Symlinks } from '../fs/filesystem';
+import { join, Symlinks } from '../fs/filesystem';
 import { ParsedFile, ParsedFunctionoidDef, parseOpenSCAD, stripComments } from './openscad-pseudoparser';
 import builtinSignatures from './openscad-builtins'
 import { mapObject } from '../utils';
@@ -192,7 +192,8 @@ export async function buildOpenSCADCompletionItemProvider(fs: FS, workingDir: st
           for (const folder of [join('/libraries', folderName), join(workingDir, folderName)]) {
             files = folderPrefix == '' ? [...Object.keys(allSymlinks)] : [];
             try {
-              files = [...(await readDirAsArray(fs, folder) ?? []), ...files];
+              files = [...(fs.readdirSync(folder) ?? []), ...files];
+              // files = [...(await readDirAsArray(fs, folder) ?? []), ...files];
               // console.log('readDir', folder, files);
               break;
             } catch (e) {