diff --git a/packages/playwright-core/src/utils/isomorphic/urlMatch.ts b/packages/playwright-core/src/utils/isomorphic/urlMatch.ts
index b20d47d220..f5d6efb70d 100644
--- a/packages/playwright-core/src/utils/isomorphic/urlMatch.ts
+++ b/packages/playwright-core/src/utils/isomorphic/urlMatch.ts
@@ -97,8 +97,12 @@ export function urlMatchesEqual(match1: URLMatch, match2: URLMatch) {
 export function urlMatches(baseURL: string | undefined, urlString: string, match: URLMatch | undefined): boolean {
   if (match === undefined || match === '')
     return true;
-  if (isString(match) && !match.startsWith('*'))
+  if (isString(match) && !match.startsWith('*')) {
+    // Allow http(s) baseURL to match ws(s) urls.
+    if (baseURL && /^https?:\/\//.test(baseURL) && /^wss?:\/\//.test(urlString))
+      baseURL = baseURL.replace(/^http/, 'ws');
     match = constructURLBasedOnBaseURL(baseURL, match);
+  }
   if (isString(match))
     match = globToRegex(match);
   if (isRegExp(match))
diff --git a/tests/library/route-web-socket.spec.ts b/tests/library/route-web-socket.spec.ts
index d3c3607c99..a4c32c874f 100644
--- a/tests/library/route-web-socket.spec.ts
+++ b/tests/library/route-web-socket.spec.ts
@@ -539,3 +539,26 @@ test('should work with no trailing slash', async ({ page, server }) => {
   await expect.poll(() => log).toEqual(['query']);
   expect(await page.evaluate(() => window.log)).toEqual(['response']);
 });
+
+test('should work with baseURL', async ({ contextFactory, server }) => {
+  const context = await contextFactory({ baseURL: 'http://localhost:' + server.PORT });
+  const page = await context.newPage();
+
+  await page.routeWebSocket('/ws', ws => {
+    ws.onMessage(message => {
+      ws.send(message);
+    });
+  });
+
+  await setupWS(page, server.PORT, 'blob');
+
+  await page.evaluate(async () => {
+    await window.wsOpened;
+    window.ws.send('echo');
+  });
+
+  await expect.poll(() => page.evaluate(() => window.log)).toEqual([
+    'open',
+    `message: data=echo origin=ws://localhost:${server.PORT} lastEventId=`,
+  ]);
+});