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-rw-r--r--numpy/ma/core.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/numpy/ma/core.py b/numpy/ma/core.py
index d5ef4461d..42db94cad 100644
--- a/numpy/ma/core.py
+++ b/numpy/ma/core.py
@@ -2877,6 +2877,7 @@ class MaskedArray(ndarray):
_recursive_or(af, bf)
else:
af |= bf
+
_recursive_or(_data._mask, mask)
else:
_data._mask = np.logical_or(mask, _data._mask)