diff --git a/configs/sandbox64_defconfig b/configs/sandbox64_defconfig
index da4bdced31..c04ecd915a 100644
--- a/configs/sandbox64_defconfig
+++ b/configs/sandbox64_defconfig
@@ -194,6 +194,7 @@ CONFIG_CMD_DHRYSTONE=y
 CONFIG_TPM=y
 CONFIG_LZ4=y
 CONFIG_ERRNO_STR=y
+CONFIG_TEST_FDTDEC=y
 CONFIG_UNIT_TEST=y
 CONFIG_UT_TIME=y
 CONFIG_UT_DM=y
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index 193e41896c..bb508a8d02 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -215,6 +215,7 @@ CONFIG_CMD_DHRYSTONE=y
 CONFIG_TPM=y
 CONFIG_LZ4=y
 CONFIG_ERRNO_STR=y
+CONFIG_TEST_FDTDEC=y
 CONFIG_UNIT_TEST=y
 CONFIG_UT_TIME=y
 CONFIG_UT_DM=y