--- sys/modules/pefs/Makefile.orig
+++ sys/modules/pefs/Makefile
@@ -8,7 +8,7 @@
 	pefs_dircache.c \
 	pefs_xts.c vmac.c
 
-.if ${MACHINE_CPUARCH} == "i386" || ${MACHINE_CPUARCH} == "amd64"
+.if defined(PEFS_AESNI)
 SRCS+=	pefs_aesni.c
 CFLAGS+= -DPEFS_AESNI
 .endif