diff --git a/asio/.codespellrc b/asio/.codespellrc
index 5bf88c7a1b..8a3a7926e1 100644
--- a/asio/.codespellrc
+++ b/asio/.codespellrc
@@ -1,5 +1,5 @@
 [codespell]
-builtin = clear,rare,en-GB_to_en-US,names,informal,code
+builtin = clear,rare,names,informal,code
 check-filenames =
 check-hidden =
 skip = */.git,*/build,*/prefix