diff --git a/test/common/wpt/worker.js b/test/common/wpt/worker.js
index 74a35419cd1dfa..9edc2b64795805 100644
--- a/test/common/wpt/worker.js
+++ b/test/common/wpt/worker.js
@@ -92,6 +92,8 @@ const timeout = setTimeout(() => {
 // eslint-disable-next-line no-undef
 add_completion_callback((_, status) => {
   clearTimeout(timeout);
+  // Match browsers: exceptions thrown after done() do not fail the test.
+  process.on('uncaughtException', () => {});
   parentPort.postMessage({
     type: 'completion',
     status,