diff --git a/Makefile b/Makefile
index b37df44e25b..d38fa5d6aca 100644
--- a/Makefile
+++ b/Makefile
@@ -2138,6 +2138,7 @@ quiet_cmd_gen_envp = ENVP    $@
 			-D__ASSEMBLY__ \
 			-D__UBOOT_CONFIG__ \
 			-DDEFAULT_DEVICE_TREE=$(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE)) \
+			-DDEFAULT_FDT_FILE=$(subst ",,$(CONFIG_DEFAULT_FDT_FILE)) \
 			-I . -I include -I $(srctree)/include \
 			-include linux/kconfig.h -include include/config.h \
 			-I$(srctree)/arch/$(ARCH)/include \
diff --git a/board/sifive/unmatched/unmatched.env b/board/sifive/unmatched/unmatched.env
index 34425dc9efa..f309229481b 100644
--- a/board/sifive/unmatched/unmatched.env
+++ b/board/sifive/unmatched/unmatched.env
@@ -16,4 +16,4 @@ partitions=
     name=loader1,start=17K,size=1M,type=${type_guid_gpt_loader1};
     name=loader2,size=4MB,type=${type_guid_gpt_loader2};
     name=system,size=-,bootable,type=${type_guid_gpt_system};
-fdtfile=CONFIG_DEFAULT_FDT_FILE
+fdtfile=DEFAULT_FDT_FILE