Index: qemu/net.h
@@ -173,8 +173,8 @@ void net_host_device_remove(Monitor *mon
 int do_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret_data);
 int do_netdev_del(Monitor *mon, const QDict *qdict, QObject **ret_data);
 
-#define DEFAULT_NETWORK_SCRIPT "/etc/qemu-ifup"
-#define DEFAULT_NETWORK_DOWN_SCRIPT "/etc/qemu-ifdown"
+#define DEFAULT_NETWORK_SCRIPT PREFIX "/etc/qemu-ifup"
+#define DEFAULT_NETWORK_DOWN_SCRIPT PREFIX "/etc/qemu-ifdown"
 
 void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd);
 
Index: qemu/net/tap.h
@@ -29,8 +29,8 @@
 #include "qemu-common.h"
 #include "qemu-option.h"
 
-#define DEFAULT_NETWORK_SCRIPT "/etc/qemu-ifup"
-#define DEFAULT_NETWORK_DOWN_SCRIPT "/etc/qemu-ifdown"
+#define DEFAULT_NETWORK_SCRIPT PREFIX "/etc/qemu-ifup"
+#define DEFAULT_NETWORK_DOWN_SCRIPT PREFIX "/etc/qemu-ifdown"
 
 int net_init_tap(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan);