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-rw-r--r--ext/socket/socket.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/socket/socket.c b/ext/socket/socket.c
index ac2cac8809..2ffa84b296 100644
--- a/ext/socket/socket.c
+++ b/ext/socket/socket.c
@@ -183,7 +183,7 @@ init_sock(sock, fd)
MakeOpenFile(sock, fp);
fp->fd = fd;
- fp->mode = FMODE_READWRITE;
+ fp->mode = FMODE_READWRITE|FMODE_DUPLEX;
if (do_not_reverse_lookup) {
fp->mode |= FMODE_NOREVLOOKUP;
}