diff --git a/usr.sbin/acpi/Makefile.inc b/usr.sbin/acpi/Makefile.inc
index c5f729f6ff1a..8804492c5426 100644
--- a/usr.sbin/acpi/Makefile.inc
+++ b/usr.sbin/acpi/Makefile.inc
@@ -3,4 +3,6 @@
 
 CFLAGS+= -I${.CURDIR}/../../../sys
 
-.include "../Makefile.inc"
+.if exists(${.CURDIR}/../../Makefile.inc)
+.include "${.CURDIR}/../../Makefile.inc"
+.endif