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-rw-r--r--numpy/lib/nanfunctions.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/numpy/lib/nanfunctions.py b/numpy/lib/nanfunctions.py
index 18ccab3b8..0ae74bbbb 100644
--- a/numpy/lib/nanfunctions.py
+++ b/numpy/lib/nanfunctions.py
@@ -99,7 +99,7 @@ def _replace_nan(a, val):
if a.dtype == np.object_:
# object arrays do not support `isnan` (gh-9009), so make a guess
- mask = a != a
+ mask = (a != a).astype(bool)
elif issubclass(a.dtype.type, np.inexact):
mask = np.isnan(a)
else: