diff --git a/tools/tools/ncpus/Makefile b/tools/tools/ncpus/Makefile
index 7d2410c2e138..ccbc8f50c17c 100644
--- a/tools/tools/ncpus/Makefile
+++ b/tools/tools/ncpus/Makefile
@@ -1,7 +1,10 @@
 # $FreeBSD$
 
 PROG=	ncpus
-SRCS=	ncpus.c acpi.c biosmptable.c
+SRCS=	ncpus.c acpi.c
+.if ${MACHINE_ARCH} == "amd64" || ${MACHINE_ARCH} == "i386"
+SRCS+=	biosmptable.c
+.endif
 NO_MAN= noman
 BINDIR=	/usr/local/bin
 
diff --git a/tools/tools/ncpus/ncpus.c b/tools/tools/ncpus/ncpus.c
index f0d3a6bcd61d..7c051a62cb96 100644
--- a/tools/tools/ncpus/ncpus.c
+++ b/tools/tools/ncpus/ncpus.c
@@ -9,6 +9,8 @@ int
 main(int argc, char *argv[])
 {
 	printf("acpi: %d\n", acpi_detect());
+#if defined(__amd64__) || defined(__i386__)
 	printf("mptable: %d\n", biosmptable_detect());
+#endif
 	return 0;
 }