diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile
index 155dbeb..4ac85d4 100644
--- a/drivers/mailbox/Makefile
+++ b/drivers/mailbox/Makefile
@@ -6,3 +6,4 @@
 obj-$(CONFIG_SANDBOX_MBOX) += sandbox-mbox.o
 obj-$(CONFIG_SANDBOX_MBOX) += sandbox-mbox-test.o
 obj-$(CONFIG_TEGRA_HSP) += tegra-hsp.o
+obj-$(CONFIG_K3_SEC_PROXY) += k3-sec-proxy.o