diff --git a/Makefile b/Makefile
index 57698d048e2c..41fc7681fbab 100644
--- a/Makefile
+++ b/Makefile
@@ -1368,7 +1368,7 @@ PHONY += kselftest-merge
 kselftest-merge:
 	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
 	$(Q)find $(srctree)/tools/testing/selftests -name config | \
-		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
+		xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config
 	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
 
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