diff --git a/conf/machine/include/rpi-base.inc b/conf/machine/include/rpi-base.inc
index e097702..c8f6cd6 100644
--- a/conf/machine/include/rpi-base.inc
+++ b/conf/machine/include/rpi-base.inc
@@ -37,7 +37,7 @@ KERNEL_DEVICETREE ?= " \
     "
 KERNEL_IMAGETYPE ?= "Image"
 
-MACHINE_FEATURES = "kernel26 apm usbhost keyboard vfat ext2 screen touchscreen alsa bluetooth wifi sdio"
+MACHINE_FEATURES += "kernel26 apm usbhost keyboard vfat ext2 screen touchscreen alsa bluetooth wifi sdio"
 
 # Raspberry Pi has no hardware clock
 MACHINE_FEATURES_BACKFILL_CONSIDERED = "rtc"