From a11aab3960005e89f812c59731099de981d73784 Mon Sep 17 00:00:00 2001
From: Robert Kende <robert.kende@gmail.com>
Date: Mon, 11 Jun 2012 15:42:38 +0200
Subject: BUG: fix pickling MaskedConstant

---
 numpy/ma/core.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/numpy/ma/core.py b/numpy/ma/core.py
index a57cdf5c1..a6f252067 100644
--- a/numpy/ma/core.py
+++ b/numpy/ma/core.py
@@ -5718,6 +5718,12 @@ class MaskedConstant(MaskedArray):
     def flatten(self):
         return masked_array([self._data], dtype=float, mask=[True])
 
+    def __reduce__(self):
+        """Override of MaskedArray's __reduce__.
+        """
+        return (self.__class__, ())
+
+
 masked = masked_singleton = MaskedConstant()
 
 
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