diff --git a/src/browser/chrome.ts b/src/browser/chrome.ts
index ccc820f47..48767dbcf 100644
--- a/src/browser/chrome.ts
+++ b/src/browser/chrome.ts
@@ -134,7 +134,7 @@ async function canRunCdpHealthCommand(
       handshakeTimeoutMs: timeoutMs,
     });
     let settled = false;
-    const onMessage = (raw: WebSocket.RawData) => {
+    const onMessage = (raw: Parameters<typeof rawDataToString>[0]) => {
       if (settled) {
         return;
       }