From 026ba68c1056fb6729868456fba3382f8b9a0fcf Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@oriontransfer.co.nz>
Date: Tue, 15 Sep 2020 18:50:42 +1200
Subject: Fix handling of FMODE_PREP.

---
 io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/io.c b/io.c
index e5fac3c18c..b615aca8c1 100644
--- a/io.c
+++ b/io.c
@@ -1306,7 +1306,7 @@ rb_io_from_fd(int f)
     rb_io_t *fptr;
     RB_IO_POINTER(io, fptr);
 
-    fptr->mode &= ~FMODE_PREP;
+    fptr->mode |= FMODE_PREP;
 
     return io;
 }
-- 
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