diff --git a/boards/sim/sim/sim/configs/rpproxy/defconfig b/boards/sim/sim/sim/configs/rpproxy/defconfig
index d8b7b3582f..ec2cae3732 100644
--- a/boards/sim/sim/sim/configs/rpproxy/defconfig
+++ b/boards/sim/sim/sim/configs/rpproxy/defconfig
@@ -45,6 +45,11 @@ CONFIG_READLINE_CMD_HISTORY=y
 CONFIG_READLINE_TABCOMPLETION=y
 CONFIG_RPMSG_UART=y
 CONFIG_RPTUN=y
+CONFIG_RTC=y
+CONFIG_RTC_ARCH=y
+CONFIG_RTC_DRIVER=y
+CONFIG_RTC_EXTERNAL=y
+CONFIG_RTC_RPMSG=y
 CONFIG_SCHED_CHILD_STATUS=y
 CONFIG_SCHED_HAVE_PARENT=y
 CONFIG_SCHED_HPWORK=y
diff --git a/boards/sim/sim/sim/configs/rpserver/defconfig b/boards/sim/sim/sim/configs/rpserver/defconfig
index cce43ddc8f..f7118425b7 100644
--- a/boards/sim/sim/sim/configs/rpserver/defconfig
+++ b/boards/sim/sim/sim/configs/rpserver/defconfig
@@ -54,6 +54,10 @@ CONFIG_READLINE_CMD_HISTORY=y
 CONFIG_READLINE_TABCOMPLETION=y
 CONFIG_RPMSG_UART=y
 CONFIG_RPTUN=y
+CONFIG_RTC=y
+CONFIG_RTC_ARCH=y
+CONFIG_RTC_DRIVER=y
+CONFIG_RTC_RPMSG=y
 CONFIG_SCHED_CHILD_STATUS=y
 CONFIG_SCHED_HAVE_PARENT=y
 CONFIG_SCHED_HPWORK=y
diff --git a/drivers/timers/Kconfig b/drivers/timers/Kconfig
index fedf15b532..686143a652 100644
--- a/drivers/timers/Kconfig
+++ b/drivers/timers/Kconfig
@@ -295,7 +295,6 @@ config RTC_RPMSG
 	bool "Rpmsg RTC Driver"
 	default n
 	depends on OPENAMP
-	depends on RTC_EXTERNAL
 	select ARCH_HAVE_RTC_SUBSECONDS
 
 endif # RTC