diff --git a/configs/sandbox_flattree_defconfig b/configs/sandbox_flattree_defconfig
index 7cc76bf271..f184723a89 100644
--- a/configs/sandbox_flattree_defconfig
+++ b/configs/sandbox_flattree_defconfig
@@ -203,6 +203,7 @@ CONFIG_RSA_VERIFY_WITH_PKEY=y
 CONFIG_TPM=y
 CONFIG_LZ4=y
 CONFIG_ERRNO_STR=y
+CONFIG_HEXDUMP=y
 CONFIG_UNIT_TEST=y
 CONFIG_UT_TIME=y
 CONFIG_UT_DM=y