diff -r 4b0692880dfa -r 420b40cb3997 tools/libxl/libxl_dm.c
--- a/tools/libxl/libxl_dm.c	Thu May 05 17:40:34 2011 +0100
+++ b/tools/libxl/libxl_dm.c	Fri May 06 13:55:00 2011 +0100
@@ -773,7 +773,7 @@
     path = libxl__sprintf(gc, "/local/domain/%d/hvmloader", info->domid);
     xs_mkdir(ctx->xsh, XBT_NULL, path);
     libxl__xs_write(gc, XBT_NULL, libxl__sprintf(gc, "%s/bios", path),
-                    libxl__domain_bios(gc, info));
+                    "%s", libxl__domain_bios(gc, info));
 
     path = libxl__sprintf(gc, "/local/domain/0/device-model/%d", info->domid);
     xs_mkdir(ctx->xsh, XBT_NULL, path);