diff --git a/sys/modules/drm2/i915kms/Makefile b/sys/modules/drm2/i915kms/Makefile
index 39f37c9217c5..75f08d24182b 100644
--- a/sys/modules/drm2/i915kms/Makefile
+++ b/sys/modules/drm2/i915kms/Makefile
@@ -34,8 +34,18 @@ SRCS	= \
 SRCS	+= i915_ioc32.c
 .endif
 
-SRCS	+= device_if.h fb_if.h bus_if.h pci_if.h iicbus_if.h iicbb_if.h \
-	 opt_drm.h opt_compat.h opt_syscons.h
+SRCS	+=								\
+	opt_acpi.h							\
+	opt_compat.h							\
+	opt_drm.h							\
+	opt_syscons.h							\
+	acpi_if.h							\
+	bus_if.h							\
+	fb_if.h								\
+	device_if.h							\
+	iicbb_if.h							\
+	iicbus_if.h							\
+	pci_if.h
 
 .include <bsd.kmod.mk>