diff --git a/tensorboard/backend/http_util.py b/tensorboard/backend/http_util.py
index f3caf3a73aa..bc0322f942f 100644
--- a/tensorboard/backend/http_util.py
+++ b/tensorboard/backend/http_util.py
@@ -36,7 +36,7 @@
 # @vaadin/vaadin-lumo-styles/font-icons(via vaadin-grid) uses data URI for
 # loading font icons.
 _CSP_FONT_DOMAINS_WHITELIST = ["data:"]
-_CSP_FRAME_DOMAINS_WHITELIST = []
+_CSP_FRAME_DOMAINS_WHITELIST = ["https://ui.perfetto.dev"]
 _CSP_IMG_DOMAINS_WHITELIST = []
 _CSP_SCRIPT_DOMAINS_WHITELIST = []
 _CSP_CONNECT_DOMAINS_WHITELIST = []