diff --git a/mediapipe/web/graph_runner/graph_runner.ts b/mediapipe/web/graph_runner/graph_runner.ts
index bf033750..5f222603 100644
--- a/mediapipe/web/graph_runner/graph_runner.ts
+++ b/mediapipe/web/graph_runner/graph_runner.ts
@@ -1202,7 +1202,7 @@ export class GraphRunner {
 }
 
 // Quick private helper to run the given script safely
-async function runScript(scriptUrl: string) {
+async function runScript(scriptUrl: string|string) {
   if (typeof importScripts === 'function') {
     importScripts(scriptUrl.toString());
   } else {