diff --git a/configs/ipam390_defconfig b/configs/ipam390_defconfig
index d686987..72ceb5e 100644
--- a/configs/ipam390_defconfig
+++ b/configs/ipam390_defconfig
@@ -21,6 +21,7 @@
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_DIAG=y
 CONFIG_CMD_UBI=y
 # CONFIG_MMC is not set
 CONFIG_SYS_NS16550=y