diff --git a/server-timing/idlharness.https.any.js b/server-timing/idlharness.https.any.js
index b55c741df39e47..44bffcf59e6bf6 100644
--- a/server-timing/idlharness.https.any.js
+++ b/server-timing/idlharness.https.any.js
@@ -1,5 +1,6 @@
 // META: script=/resources/WebIDLParser.js
 // META: script=/resources/idlharness.js
+// META: timeout=long
 
 'use strict';
 
diff --git a/uievents/idlharness.window.js b/uievents/idlharness.window.js
index 928c8c90f0ff4e..f6a74b8a3a7ac5 100644
--- a/uievents/idlharness.window.js
+++ b/uievents/idlharness.window.js
@@ -1,5 +1,6 @@
 // META: script=/resources/WebIDLParser.js
 // META: script=/resources/idlharness.js
+// META: timeout=long
 
 'use strict';