diff --git a/synth/snsynth/mwem.py b/synth/snsynth/mwem.py
index 9d300ff8..0ad1ac84 100644
--- a/synth/snsynth/mwem.py
+++ b/synth/snsynth/mwem.py
@@ -573,7 +573,7 @@ def _histogram_from_data_attributes(self, data, splits=[]):
             # our ranges above
             if any([a > 0 for a in mins_data]):
                 warnings.warn("Data should be preprocessed to have 0 based indices.")
-            dimensionality = np.product(dims_sizes)
+            dimensionality = np.prod(dims_sizes)
             if dimensionality > 1e8:
                 warnings.warn(f"Dimensionality of histogram is {dimensionality:,}, consider using splits.")
             histogram, bins = np.histogramdd(split_data, bins=dims_sizes)