1 files changed, 1 insertions, 1 deletions
diff --git a/ext/socket/socket.c b/ext/socket/socket.c
index 93a8aacce3..4c0934a87b 100644
--- a/ext/socket/socket.c
+++ b/ext/socket/socket.c
@@ -115,7 +115,7 @@ sock_new(class, fd)
 #endif
     fp->f2 = rb_fdopen(fd, "w");
     fp->mode = FMODE_READWRITE;
-    rb_io_unbuffered(fp);
+    rb_io_synchronized(fp);
 
     return (VALUE)sock;
 }