diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
index cfedb3025c26..77a2b2d74f3f 100644
--- a/drivers/firmware/efi/libstub/Makefile
+++ b/drivers/firmware/efi/libstub/Makefile
@@ -95,8 +95,10 @@ CFLAGS_zboot-decompress-gzip.o	+= -I$(srctree)/lib/zlib_inflate
 zboot-obj-$(CONFIG_KERNEL_ZSTD)	:= zboot-decompress-zstd.o lib-xxhash.o
 CFLAGS_zboot-decompress-zstd.o	+= -I$(srctree)/lib/zstd
 
-zboot-obj-$(CONFIG_RISCV)	+= lib-clz_ctz.o lib-ashldi3.o
-zboot-obj-$(CONFIG_LOONGARCH)	+= lib-clz_ctz.o lib-ashldi3.o
+zboot-riscv-obj-$(CONFIG_32BIT)	:= lib-ashldi3.o lib-lshrdi3.o
+zboot-obj-$(CONFIG_RISCV)	+= lib-clz_ctz.o $(zboot-riscv-obj-y)
+zboot-loongarch-obj-$(CONFIG_32BIT) := lib-ashldi3.o lib-lshrdi3.o
+zboot-obj-$(CONFIG_LOONGARCH)	+= lib-clz_ctz.o $(zboot-loongarch-obj-y)
 lib-$(CONFIG_EFI_ZBOOT)		+= zboot.o $(zboot-obj-y)
 
 lib-$(CONFIG_UNACCEPTED_MEMORY) += unaccepted_memory.o bitmap.o find.o