diff --git a/conf/machine/keystone-evm.conf b/conf/machine/keystone-evm.conf
index 0b6d7ab9..5e264a8f 100644
--- a/conf/machine/keystone-evm.conf
+++ b/conf/machine/keystone-evm.conf
@@ -14,7 +14,7 @@ require conf/machine/include/keystone.inc
 
 PREFERRED_PROVIDER_virtual/kernel = "linux-keystone"
 
-IMAGE_FSTYPES += "tar.bz2"
+IMAGE_FSTYPES += "tar.bz2 cpio"
 
 SERIAL_CONSOLE = "115200 ttyO0"