diff --git a/meta/conf/machine/qemuppc64.conf b/meta/conf/machine/qemuppc64.conf
index 304f06a30d..7709339313 100644
--- a/meta/conf/machine/qemuppc64.conf
+++ b/meta/conf/machine/qemuppc64.conf
@@ -15,6 +15,7 @@ QB_MACHINE = "-machine pseries"
 QB_CPU = "-cpu POWER9"
 QB_SMP = "-smp 2"
 
+QB_NFSROOTFS_EXTRA_OPT = "wsize=524288,rsize=524288"
 QB_KERNEL_CMDLINE_APPEND = "console=hvc0 nohugevmalloc"
 #QB_OPT_APPEND += "-device qemu-xhci -device usb-tablet -device usb-kbd"
 QB_OPT_APPEND = "-usb -device usb-tablet"