diff --git a/features.def b/features.def
index 63ea3419..68c9776b 100644
--- a/features.def
+++ b/features.def
@@ -18,7 +18,7 @@ char *|proc_args|ulong(size)|pid_t(pid):unsigned(max_len)
 array(glibtop_map_entry)|proc_map|ulong(number,size,total)|pid_t(pid)
 array(glibtop_mountentry)|@mountlist|ulong(number,size,total)|int(all_fs)
 retval|@fsusage|ulong(blocks,bfree,bavail,files,ffree)|string(mount_dir)
-array(glibtop_interface)|interface_names|ulong(size)|ulong(interface,number,instance,strategy)
+array(glibtop_interface)|interface_names|ulong(number,size,total)|ulong(interface,number,instance,strategy)
 retval|netinfo|ulong(if_flags,transport,mtu,subnet,address)|string(interface):unsigned(transport)
 retval|netload|ulong(packets_in,packets_out,packets_total,bytes_in,bytes_out,bytes_total,errors_in,errors_out,errors_total,collisions)|string(interface):unsigned(transport,protocol)
 retval|ppp|ulong(state,bytes_in,bytes_out)|ushort(device)