diff --git a/sys/modules/gpio/gpioaei/Makefile b/sys/modules/gpio/gpioaei/Makefile
index 514dcd80a35..8f856af48eb 100644
--- a/sys/modules/gpio/gpioaei/Makefile
+++ b/sys/modules/gpio/gpioaei/Makefile
@@ -4,6 +4,7 @@ KMOD=	gpioaei
 SRCS=	gpioaei.c
 
 SRCS+=	\
+	acpi_if.h \
 	bus_if.h \
 	device_if.h \
 	gpio_if.h \