diff --git a/packages/playwright-core/src/server/webkit/wkInterceptableRequest.ts b/packages/playwright-core/src/server/webkit/wkInterceptableRequest.ts
index 55aabf0575..5218420480 100644
--- a/packages/playwright-core/src/server/webkit/wkInterceptableRequest.ts
+++ b/packages/playwright-core/src/server/webkit/wkInterceptableRequest.ts
@@ -75,7 +75,7 @@ export class WKInterceptableRequest {
       requestStart: timingPayload ? wkMillisToRoundishMillis(timingPayload.requestStart) : -1,
       responseStart: timingPayload ? wkMillisToRoundishMillis(timingPayload.responseStart) : -1,
     };
-    const setCookieSeparator = process.platform === 'darwin' ? ',' : '\n';
+    const setCookieSeparator = process.platform === 'darwin' ? ',' : 'playwright-set-cookie-separator';
     const response = new network.Response(this.request, responsePayload.status, responsePayload.statusText, headersObjectToArray(responsePayload.headers, ',', setCookieSeparator), timing, getResponseBody, responsePayload.source === 'service-worker');
 
     // No raw response headers in WebKit, use "provisional" ones.