diff --git a/plat/rpi3/platform.mk b/plat/rpi3/platform.mk
index fa7e5eb..5990f27 100644
--- a/plat/rpi3/platform.mk
+++ b/plat/rpi3/platform.mk
@@ -20,7 +20,8 @@
 				plat/common/aarch64/platform_mp_stack.S	\
 				plat/rpi3/aarch64/plat_helpers.S	\
 				plat/rpi3/rpi3_bl1_setup.c		\
-				plat/rpi3/rpi3_io_storage.c
+				plat/rpi3/rpi3_io_storage.c		\
+				plat/rpi3/rpi3_mbox.c
 
 BL2_SOURCES		+=	common/desc_image_load.c		\
 				drivers/io/io_fip.c			\