diff --git a/script/html-proofer b/script/html-proofer
index 2c57a8b..a1c4b4c 100755
--- a/script/html-proofer
+++ b/script/html-proofer
@@ -7,6 +7,7 @@ require "html-proofer"
 url_ignores = [
   # Installation links require being signed in to GitHub
   %r{https://github.com/apps/.*/installations/new},
+  "https://mochajs.org/",
 ]
 
 begin