diff --git a/top/top.c b/top/top.c
index 83baab77..2fcd1e13 100644
--- a/top/top.c
+++ b/top/top.c
@@ -3824,6 +3824,8 @@ static const char *configs_file (FILE *fp, const char *name, float *delay) {
    }
    if (Rc.id < 'a' || Rc.id > RCF_VERSION_ID)
       return p;
+   if (strchr("bcde", Rc.id))
+      return p;
    if (Rc.mode_altscr < 0 || Rc.mode_altscr > 1)
       return p;
    if (Rc.mode_irixps < 0 || Rc.mode_irixps > 1)