diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile
index 4ac85d4..243ff6f 100644
--- a/drivers/mailbox/Makefile
+++ b/drivers/mailbox/Makefile
@@ -2,7 +2,7 @@
 #
 # SPDX-License-Identifier: GPL-2.0
 
-obj-$(CONFIG_DM_MAILBOX) += mailbox-uclass.o
+obj-$(CONFIG_$(SPL_)DM_MAILBOX) += mailbox-uclass.o
 obj-$(CONFIG_SANDBOX_MBOX) += sandbox-mbox.o
 obj-$(CONFIG_SANDBOX_MBOX) += sandbox-mbox-test.o
 obj-$(CONFIG_TEGRA_HSP) += tegra-hsp.o