diff --git a/conf/machine/include/rpi-base.inc b/conf/machine/include/rpi-base.inc
index 0ae64f8..db0bbcc 100644
--- a/conf/machine/include/rpi-base.inc
+++ b/conf/machine/include/rpi-base.inc
@@ -129,7 +129,7 @@ KERNEL_IMAGETYPE ?= "${@bb.utils.contains('RPI_USE_U_BOOT', '1', \
 MACHINE_FEATURES += "apm usbhost keyboard vfat ext2 screen touchscreen alsa bluetooth wifi sdio ${@bb.utils.contains('DISABLE_VC4GRAPHICS', '1', '', 'vc4graphics', d)}"
 
 # Raspberry Pi has no hardware clock
-MACHINE_FEATURES_BACKFILL_CONSIDERED = "rtc"
+MACHINE_FEATURES_OPTED_OUT:append = " rtc"
 
 MACHINE_EXTRA_RRECOMMENDS += "kernel-modules udev-rules-rpi"
 MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS += "${@oe.utils.conditional('ENABLE_I2C', '1', 'kernel-module-i2c-dev kernel-module-i2c-bcm2708', '', d)}"