diff --git a/tests/fixtures/native-cleanup-probe.mjs b/tests/fixtures/native-cleanup-probe.mjs
index 75d114b..8371472 100644
--- a/tests/fixtures/native-cleanup-probe.mjs
+++ b/tests/fixtures/native-cleanup-probe.mjs
@@ -82,8 +82,8 @@ export function registerCleanupProbe(file, kind) {
         assert.equal(held, true, facts);
         assert.equal(forced, false, facts);
         assert.deepEqual(result, { code: 1, signal: null }, facts);
-        assert.match(output, /testTimeoutFailure/, facts);
-        assert.match(output, /Native fixture interrupted:/, facts);
+        assert.equal(/testTimeoutFailure/.test(output), true, facts);
+        assert.equal(/Native fixture interrupted:/.test(output), true, facts);
       } finally {
         clearTimeout(timer);
         if (