diff -rup libvirt-0.8.3.orig/src/qemu/qemu_conf.c libvirt-0.8.3.new/src/qemu/qemu_conf.c
--- libvirt-0.8.3.orig/src/qemu/qemu_conf.c	2010-08-04 13:21:27.000000000 +0100
+++ libvirt-0.8.3.new/src/qemu/qemu_conf.c	2010-08-23 21:08:13.239794362 +0100
@@ -3651,7 +3651,7 @@ int qemudBuildCommandLine(virConnectPtr 
 {
     int i;
     char memory[50];
-    char boot[VIR_DOMAIN_BOOT_LAST];
+    char boot[VIR_DOMAIN_BOOT_LAST+1];
     struct utsname ut;
     int disableKQEMU = 0;
     int disableKVM = 0;