diff --git a/sanitize_ignorelist_ubsan b/sanitize_ignorelist_ubsan
index e69de29bb2..4bf2294e98 100644
--- a/sanitize_ignorelist_ubsan
+++ b/sanitize_ignorelist_ubsan
@@ -0,0 +1,5 @@
+# This is saying boost::beast::detail::chacha<20> is improperly aligned at address 0x000144891008.
+# This class has a member variable that is marked alignas(16) which means the object should be aligned an a 16-byte boundary which it isn’t.
+# Looking at where it’s instantiated it’s a static local function variable that is also thread_local.
+# This could be some sort of bug in the thread_local alignment, maybe in combination with being a static local function variable.
+src:*/beast/core/detail/chacha.hpp
\ No newline at end of file