diff --git a/test/runner/index.js b/test/runner/index.js
index b9f4e3bc6..0a8ef5c84 100644
--- a/test/runner/index.js
+++ b/test/runner/index.js
@@ -402,7 +402,7 @@ class TestRunner {
 			);
 		const esmCache = new Map();
 		const { category, name, round } = this.testMeta;
-		const esmIdentifier = `${category.name}-${name}-${round || 0}`;
+		const esmIdentifier = `${category}-${name}-${round || 0}`;
 		let esmContext = null;
 		return (moduleInfo, context) => {
 			const asModule = require("../helpers/asModule");