diff --git a/build/autoconf/config.sub.orig b/build/autoconf/config.sub
index 1d8e98bce..e1d397a3c 100755
--- a/build/autoconf/config.sub.orig
+++ b/build/autoconf/config.sub
@@ -1390,7 +1390,7 @@ case $os in
	      | -powermax* | -dnix* | -nx6 | -nx7 | -sei* | -dragonfly* \
	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops* | -es* \
	      | -onefs* | -tirtos* | -phoenix* | -fuchsia* | -redox* | -bme* \
-	      | -midnightbsd*)
+	      | -midnightbsd* | -serenity*)
	# Remember, each alternative MUST END IN *, to match a version number.
		;;
	-qnx*)