diff --git a/filter/config.Y b/filter/config.Y
index accf3184..0bbc3252 100644
--- a/filter/config.Y
+++ b/filter/config.Y
@@ -378,7 +378,7 @@ term:
  | rtadot FROM    { $$ = f_new_inst(); $$->code = 'a'; $$->aux = T_IP; $$->a2.i = OFFSETOF(struct rta, from); }
 
  | rtadot GW      { $$ = f_new_inst(); $$->code = 'a'; $$->aux = T_IP; $$->a2.i = OFFSETOF(struct rta, gw); }
- | rtadot NET     { $$ = f_new_inst(); $$->code = 'a'; $$->aux = T_PREFIX; $$->a2.i = 0x12345678; }
+ | rtadot NET     { $$ = f_new_inst(); $$->code = 'a'; $$->aux = T_PREFIX; $$->a2.i = 0x12345678; /* This is actually ok - T_PREFIX is special-cased. */ }
  | rtadot SOURCE  { $$ = f_new_inst(); $$->code = 'a'; $$->aux = T_ENUM_RTS; $$->a2.i = OFFSETOF(struct rta, source); }
 
  | rtadot dynamic_attr { $$ = $2; $$->code = P('e','a'); }