diff --git a/tests/library/signals.spec.ts b/tests/library/signals.spec.ts
index 232db694f3..70f7eb51f1 100644
--- a/tests/library/signals.spec.ts
+++ b/tests/library/signals.spec.ts
@@ -64,9 +64,9 @@ test.describe('signals', () => {
     const pid = await remoteServer.out('pid');
     process.kill(-pid, 'SIGKILL');
     if (isMac && browserName === 'webkit' && parseInt(os.release(), 10) > 22 && os.arch() === 'arm64') {
-      // WebKit on newer macOS exits differently.
-      expect(await remoteServer.out('exitCode')).toBe('137');
-      expect(await remoteServer.out('signal')).toBe('null');
+      // WebKit on newer macOS exits sometimes with exit code, sometimes with signal.
+      expect('exitCode:' + await remoteServer.out('exitCode') +
+             'signal:' + await remoteServer.out('signal')).toMatch(/exitCode:137|signal:SIGKILL/);
     } else {
       expect(await remoteServer.out('exitCode')).toBe('null');
       expect(await remoteServer.out('signal')).toBe('SIGKILL');