diff --git a/configs/yellowstone_defconfig b/configs/yellowstone_defconfig
index 8331a2d..1eb3eef 100644
--- a/configs/yellowstone_defconfig
+++ b/configs/yellowstone_defconfig
@@ -16,6 +16,7 @@
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
 CONFIG_CMD_CACHE=y
+CONFIG_CMD_DIAG=y
 CONFIG_MAC_PARTITION=y
 CONFIG_DOS_PARTITION=y
 CONFIG_ISO_PARTITION=y