diff --git a/js/tests/test.mjs b/js/tests/test.mjs
index 0164263e..5815103b 100644
--- a/js/tests/test.mjs
+++ b/js/tests/test.mjs
@@ -46,7 +46,7 @@ const { join } = []
 const { split } = ''
 const stackFmt = (err, url) => {
   if (!(err instanceof Error)) {
-    throw Error(`Unexpected type thrown: ${typeof err}. usage: throw Error('my message'))`)
+    throw Error(`Unexpected type thrown: ${typeof err}. usage: throw Error('my message')`)
   }
   String.prototype.split = split
   Array.prototype.join = join