diff --git a/core/test/lib/network-request-test.js b/core/test/lib/network-request-test.js
index fbbed066e144..2a48e292621f 100644
--- a/core/test/lib/network-request-test.js
+++ b/core/test/lib/network-request-test.js
@@ -394,7 +394,7 @@ describe('NetworkRequest', () => {
     const isContentEncoded = NetworkRequest.isContentEncoded;
 
     it('correctly identifies no compression', () => {
-      expect(isContentEncoded({responseHeaders: {}})).toBe(false);
+      expect(isContentEncoded({responseHeaders: []})).toBe(false);
     });
     it('correctly identifies brotli', () => {
       expect(isContentEncoded({