1 files changed, 5 insertions, 6 deletions

diff --git a/src/lib_io.c b/src/lib_io.c
index 31f0ea97..53c17d92 100644
--- a/src/lib_io.c
+++ b/src/lib_io.c
@@ -203,13 +203,12 @@ static int io_file_read(lua_State *L, FILE *fp, int start)
     for (n = start; nargs-- && ok; n++) {
       if (tvisstr(L->base+n)) {
         const char *p = strVdata(L->base+n);
-        if (p[0] != '*')
-          lj_err_arg(L, n+1, LJ_ERR_INVOPT);
-        if (p[1] == 'n')
+        if (p[0] == '*') p++;
+        if (p[0] == 'n')
           ok = io_file_readnum(L, fp);
-        else if ((p[1] & ~0x20) == 'L')
-          ok = io_file_readline(L, fp, (p[1] == 'l'));
-        else if (p[1] == 'a')
+        else if ((p[0] & ~0x20) == 'L')
+          ok = io_file_readline(L, fp, (p[0] == 'l'));
+        else if (p[0] == 'a')
           io_file_readall(L, fp);
         else
           lj_err_arg(L, n+1, LJ_ERR_INVFMT);