diff --git a/examples/openthread/ot_sleepy_device/deep_sleep/sdkconfig.defaults b/examples/openthread/ot_sleepy_device/deep_sleep/sdkconfig.defaults
index 3edc9e3663e..0d562892a6c 100644
--- a/examples/openthread/ot_sleepy_device/deep_sleep/sdkconfig.defaults
+++ b/examples/openthread/ot_sleepy_device/deep_sleep/sdkconfig.defaults
@@ -42,8 +42,6 @@ CONFIG_IEEE802154_ENABLED=y
 #
 # deep sleep
 #
-CONFIG_ULP_COPROC_ENABLED=y
-CONFIG_ULP_COPROC_RESERVE_MEM=512
 CONFIG_NEWLIB_TIME_SYSCALL_USE_RTC_HRT=y
 CONFIG_RTC_CLK_SRC_INT_RC=y
 CONFIG_BOOTLOADER_SKIP_VALIDATE_IN_DEEP_SLEEP=y