diff --git a/sys/conf/kern.mk b/sys/conf/kern.mk
--- a/sys/conf/kern.mk
+++ b/sys/conf/kern.mk
@@ -69,7 +69,8 @@
 CWARNEXTRA+=	-Wno-error=packed-not-aligned
 .endif
 .if ${COMPILER_VERSION} >= 90100
-CWARNEXTRA+=	-Wno-address-of-packed-member
+CWARNEXTRA+=	-Wno-address-of-packed-member			\
+		-Wno-error=alloca-larger-than=
 .endif
 .endif	# gcc