diff --git a/sys/modules/pwm/pwm_backlight/Makefile b/sys/modules/pwm/pwm_backlight/Makefile
index 0d6d28af778..c7ab67b3865 100644
--- a/sys/modules/pwm/pwm_backlight/Makefile
+++ b/sys/modules/pwm/pwm_backlight/Makefile
@@ -10,6 +10,7 @@ SRCS+=	\
 	device_if.h \
 	opt_platform.h \
 	pwmbus_if.h \
+	regnode_if.h \
 	ofw_bus_if.h
 
 .include <bsd.kmod.mk>