diff --git a/config.sub b/config.sub
index 9fb7e34..3b70f0c 100755
--- a/config.sub
+++ b/config.sub
@@ -4,7 +4,7 @@
 
 # shellcheck disable=SC2006,SC2268 # see below for rationale
 
-timestamp='2023-10-28'
+timestamp='2023-10-29'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -1773,6 +1773,13 @@ case $os in
 	sco3.2v2 | sco3.2v[4-9]* | sco5v6*)
 		# Don't forget version if it is 3.2v4 or newer.
 		;;
+	# This refers to builds using the UEFI calling convention
+	# (which depends on the architecture) and PE file format.
+	# Note that this is both a different calling convention and
+	# different file format than that of GNU-EFI
+	# (x86_64-w64-mingw32).
+	uefi)
+		;;
 	none)
 		;;
 	kernel* | msvc* )
diff --git a/testsuite/config-sub.data b/testsuite/config-sub.data
index 67e1ac0..71fb289 100644
--- a/testsuite/config-sub.data
+++ b/testsuite/config-sub.data
@@ -22,6 +22,7 @@ aarch64-managarm-kernel				aarch64-unknown-managarm-kernel
 aarch64-managarm-mlibc				aarch64-unknown-managarm-mlibc
 aarch64-unknown-elf				aarch64-unknown-elf
 aarch64-unknown-linux				aarch64-unknown-linux-gnu
+aarch64-unknown-uefi				aarch64-unknown-uefi
 aarch64-wrs-vxworks				aarch64-wrs-vxworks
 aarch64-zephyr					aarch64-unknown-zephyr
 aarch64_be					aarch64_be-unknown-none
@@ -328,6 +329,7 @@ i686-ericsson-dicos				i686-ericsson-dicos
 i686-haiku					i686-pc-haiku
 i686-kopensolaris5.11-gnu			i686-pc-kopensolaris5.11-gnu
 i686-os2-emx					i686-pc-os2-emx
+i686-unknown-uefi				i686-unknown-uefi
 i686-wrs-vxworks				i686-wrs-vxworks
 i686-wrs-vxworks-simlinux			i686-wrs-vxworks-simlinux
 i686-wrs-vxworks-simwindows			i686-wrs-vxworks-simwindows
@@ -898,6 +900,7 @@ x86_64-secbsd					x86_64-pc-secbsd
 x86_64-sortix					x86_64-pc-sortix
 x86_64-twizzler				x86_64-pc-twizzler
 x86_64-unknown-ptx				x86_64-sequent-ptx
+x86_64-unknown-uefi				x86_64-unknown-uefi
 x86_64-windows					x86_64-pc-windows
 x86_64-windows-msvc				x86_64-pc-windows-msvc
 x86_64-wrs-vxworks				x86_64-wrs-vxworks