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-rw-r--r--pint/numpy_func.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/pint/numpy_func.py b/pint/numpy_func.py
index 0f220b0..bcf406a 100644
--- a/pint/numpy_func.py
+++ b/pint/numpy_func.py
@@ -339,7 +339,7 @@ Define ufunc behavior collections.
- `op_units_output_ufuncs`: determine output unit from input unit as determined by
operation (see `get_op_output_unit`)
"""
-strip_unit_input_output_ufuncs = ["isnan", "isinf", "isfinite", "signbit"]
+strip_unit_input_output_ufuncs = ["isnan", "isinf", "isfinite", "signbit", "sign"]
matching_input_bare_output_ufuncs = [
"equal",
"greater",