diff --git a/conf/machine/include/rockchip-defaults.inc b/conf/machine/include/rockchip-defaults.inc
index b41c523..0666119 100644
--- a/conf/machine/include/rockchip-defaults.inc
+++ b/conf/machine/include/rockchip-defaults.inc
@@ -22,4 +22,3 @@ XSERVER = " \
 
 # misc
 SERIAL_CONSOLES ?= "1500000;ttyS2"
-IMAGE_FSTYPES += "ext4"