diff --git a/arch/um/Kbuild b/arch/um/Kbuild
index a4e40e534e6a..6cf0c1e5927b 100644
--- a/arch/um/Kbuild
+++ b/arch/um/Kbuild
@@ -1 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0-only
+
+obj-y += kernel/ drivers/ os-Linux/
diff --git a/arch/um/Makefile b/arch/um/Makefile
index 1735a562453d..82f05f250634 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -22,10 +22,6 @@ ARCH_DIR := arch/um
 # features.
 SHELL := /bin/bash
 
-core-y			+= $(ARCH_DIR)/kernel/		\
-			   $(ARCH_DIR)/drivers/		\
-			   $(ARCH_DIR)/os-Linux/
-
 MODE_INCLUDE	+= -I$(srctree)/$(ARCH_DIR)/include/shared/skas
 
 HEADER_ARCH 	:= $(SUBARCH)