diff --git a/app/comments.test.js b/app/comments.test.js
index 9632545..78b0e0f 100644
--- a/app/comments.test.js
+++ b/app/comments.test.js
@@ -163,6 +163,7 @@ describe('postNewCriticalComments', () => {
   });
 
   it('handles multiple criticals, posting inline where possible and degrading the rest', async () => {
+    const criticalCommentPattern = /嚴重問題/;
     const inlineCalls = [];
     const issueCalls = [];
     const findings = [
@@ -181,6 +182,6 @@ describe('postNewCriticalComments', () => {
     assert.equal(inlineCalls[0].path, 'app/a.js');
     assert.equal(inlineCalls[0].line, 10);
     assert.equal(issueCalls.length, 2);
-    assert.ok(issueCalls.every(b => /嚴重問題/.test(b)));
+    assert.ok(issueCalls.every(b => criticalCommentPattern.test(b)));
   });
 });