diff --git a/package.json b/package.json
index 7d8014a..d2fa49f 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "wait": "rimraf dist && wait-on http://localhost:3000/dist/ffmpeg.dev.js",
     "test": "npm-run-all -p -r start test:all",
     "test:all": "npm-run-all wait test:browser:ffmpeg test:node:all",
-    "test:node": "node --experimental-wasm-threads --experimental-wasm-bulk-memory node_modules/.bin/_mocha --exit --bail --require ./scripts/test-helper.js",
+    "test:node": "node node_modules/mocha/bin/_mocha --exit --bail --require ./scripts/test-helper.js",
     "test:node:all": "npm run test:node -- ./tests/*.test.js",
     "test:browser": "mocha-headless-chrome -a allow-file-access-from-files -a incognito -a no-sandbox -a disable-setuid-sandbox -a disable-logging -t 300000",
     "test:browser:ffmpeg": "npm run test:browser -- -f ./tests/ffmpeg.test.html"
diff --git a/src/createFFmpeg.js b/src/createFFmpeg.js
index 61753ff..55240a6 100644
--- a/src/createFFmpeg.js
+++ b/src/createFFmpeg.js
@@ -75,14 +75,17 @@ module.exports = (_options = {}) => {
          * as we are using blob URL instead of original URL to avoid cross origin issues.
          */
         locateFile: (path, prefix) => {
-          if (typeof wasmPath !== 'undefined'
-            && path.endsWith('ffmpeg-core.wasm')) {
-            return wasmPath;
-          }
-          if (typeof workerPath !== 'undefined'
-            && path.endsWith('ffmpeg-core.worker.js')) {
-            return workerPath;
+          if (typeof window !== 'undefined' || typeof WorkerGlobalScope !== 'undefined') {
+            if (typeof wasmPath !== 'undefined'
+              && path.endsWith('ffmpeg-core.wasm')) {
+              return wasmPath;
+            }
+            if (typeof workerPath !== 'undefined'
+              && path.endsWith('ffmpeg-core.worker.js')) {
+              return workerPath;
+            }
           }
+          return prefix + path;
         },
       });
       ffmpeg = Core.cwrap('proxy_main', 'number', ['number', 'number']);