diff --git a/builtin-run.c b/builtin-run.c
index edcaf3e..f2f2d73 100644
--- a/builtin-run.c
+++ b/builtin-run.c
@@ -590,7 +591,7 @@ static struct kvm *kvm_cmd_run_init(int argc, const char **argv)
 	}
 
 	if (kvm->cfg.using_rootfs) {
-		strcat(real_cmdline, " rw rootflags=trans=virtio,version=9p2000.L,cache=loose rootfstype=9p");
+		strcat(real_cmdline, " rw rootflags=trans=virtio,version=9p2000.L,cache=mmap rootfstype=9p");
 		if (kvm->cfg.custom_rootfs) {
 			kvm_run_set_sandbox(kvm);