1 files changed, 2 insertions, 2 deletions
diff --git a/io.c b/io.c
index 61a77d7a25..9752021119 100644
--- a/io.c
+++ b/io.c
@@ -7607,8 +7607,8 @@ rb_io_s_for_fd(int argc, VALUE *argv, VALUE klass)
 static VALUE
 rb_io_autoclose_p(VALUE io)
 {
-    rb_io_t *fptr;
-    GetOpenFile(io, fptr);
+    rb_io_t *fptr = RFILE(io)->fptr;
+    rb_io_check_closed(fptr);
     return (fptr->mode & FMODE_PREP) ? Qfalse : Qtrue;
 }