diff --git a/sys/boot/efi/fdt/Makefile b/sys/boot/efi/fdt/Makefile
index 8d008e25b689..19a4c49f0d5f 100644
--- a/sys/boot/efi/fdt/Makefile
+++ b/sys/boot/efi/fdt/Makefile
@@ -10,7 +10,7 @@ INTERNALLIB=
 SRCS=		efi_fdt.c
 
 CFLAGS+=	-ffreestanding -msoft-float
-.if ${MACHINE_CPUARCH} == "arm64"
+.if ${MACHINE_CPUARCH} == "aarch64"
 CFLAGS+=	-mgeneral-regs-only
 .endif