diff --git a/src/gmail-ai-classifier/tests/performance-scalability.test.js b/src/gmail-ai-classifier/tests/performance-scalability.test.js
index b935c9cd..640d3228 100644
--- a/src/gmail-ai-classifier/tests/performance-scalability.test.js
+++ b/src/gmail-ai-classifier/tests/performance-scalability.test.js
@@ -121,7 +121,7 @@ describe('Performance and Scalability Benchmarks', () => {
     const processed = processThreadBatch(threads, config, services)
     const duration = Date.now() - startTime
 
-    expect(processed.length).toBe(BATCH_SIZE)
+    expect(processed).toHaveLength(BATCH_SIZE)
     expect(duration).toBeLessThan(100) // 100 items benchmarked under 100ms
   })
 })