diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index cb46db2..14e471d 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -55,10 +55,10 @@
 multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
 multi-objs   := $(multi-objs-y) $(multi-objs-m)
 
-# $(subdir-obj-y) is the list of objects in $(obj-y) which do not live
-# in the local directory
-__subdir-obj-y := $(foreach o,$(pbl-y),$(if $(filter-out $(o),$(notdir $(o))),$(o)))
-subdir-obj-y := $(foreach o,$(obj-y),$(if $(filter-out $(o),$(notdir $(o))),$(o)))
+# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
+# tell kbuild to descend
+__subdir-obj-y := $(filter %/built-in-pbl.o, $(pbl-y))
+subdir-obj-y := $(filter %/built-in.o, $(obj-y))
 subdir-obj-y += $(__subdir-obj-y)
 
 # $(obj-dirs) is a list of directories that contain object files