diff --git a/boards/sim/sim/sim/configs/vpnkit/defconfig b/boards/sim/sim/sim/configs/vpnkit/defconfig
index ae9cc85b563..8a2f433a828 100644
--- a/boards/sim/sim/sim/configs/vpnkit/defconfig
+++ b/boards/sim/sim/sim/configs/vpnkit/defconfig
@@ -6,7 +6,6 @@
 # modifications.
 #
 # CONFIG_NSH_CMDOPT_HEXDUMP is not set
-# CONFIG_NSH_DISABLE_DATE is not set
 CONFIG_ARCH="sim"
 CONFIG_ARCH_BOARD="sim"
 CONFIG_ARCH_BOARD_SIM=y
@@ -79,6 +78,10 @@ CONFIG_NSH_ROMFSETC=y
 CONFIG_PATH_INITIAL="/bin"
 CONFIG_POSIX_SPAWN_PROXY_STACKSIZE=2048
 CONFIG_READLINE_TABCOMPLETION=y
+CONFIG_RTC=y
+CONFIG_RTC_ARCH=y
+CONFIG_RTC_DATETIME=y
+CONFIG_RTC_DRIVER=y
 CONFIG_SCHED_HAVE_PARENT=y
 CONFIG_SCHED_LPWORKSTACKSIZE=4096
 CONFIG_SCHED_ONEXIT=y