diff --git a/python/interpret-core/interpret/utils/_compressed_dataset.py b/python/interpret-core/interpret/utils/_compressed_dataset.py
index 16d36fa59..e50cc1be3 100644
--- a/python/interpret-core/interpret/utils/_compressed_dataset.py
+++ b/python/interpret-core/interpret/utils/_compressed_dataset.py
@@ -5,7 +5,7 @@
 
 import numpy as np
 
-from ._clean_x import unify_columns, categorical_encode
+from ._clean_x import categorical_encode, unify_columns
 from ._native import Native
 
 _log = logging.getLogger(__name__)
diff --git a/python/interpret-core/interpret/utils/_native.py b/python/interpret-core/interpret/utils/_native.py
index e181fe645..01c673935 100644
--- a/python/interpret-core/interpret/utils/_native.py
+++ b/python/interpret-core/interpret/utils/_native.py
@@ -8,7 +8,6 @@
 import platform
 import struct
 import sys
-import math
 from contextlib import AbstractContextManager
 from math import prod
 
@@ -17,6 +16,14 @@
 _log = logging.getLogger(__name__)
 
 
+def _boolebm(val):
+    """Convert `bool` to `np.int32` used by libebm to represents `bool`."""
+    if not isinstance(val, (bool, np.bool_)):
+        msg = f"Native EBM functions expect boolean, got f{type(val)}"
+        raise TypeError(msg)
+    return np.int32(val)
+
+
 class Native:
     # see notes in libebm.h on the maximum representable int64 in float64 format
     FLOAT64_TO_INT64_MAX = 9223372036854774784
@@ -574,7 +581,7 @@ def cut_quantile(self, X_col, min_samples_bin, is_rounded, max_cuts):
             X_col.shape[0],
             Native._make_pointer(X_col, np.float64),
             min_samples_bin,
-            is_rounded,
+            _boolebm(is_rounded),
             ct.byref(count_cuts),
             Native._make_pointer(cuts, np.float64),
         )
@@ -657,9 +664,9 @@ def measure_dataset_header(self, n_features, n_weights, n_targets):
     def measure_feature(self, n_bins, is_missing, is_unseen, is_nominal, bin_indexes):
         n_bytes = self._unsafe.MeasureFeature(
             n_bins,
-            is_missing,
-            is_unseen,
-            is_nominal,
+            _boolebm(is_missing),
+            _boolebm(is_unseen),
+            _boolebm(is_nominal),
             len(bin_indexes),
             Native._make_pointer(bin_indexes, np.int64),
         )
@@ -711,9 +718,9 @@ def fill_feature(
     ):
         return_code = self._unsafe.FillFeature(
             n_bins,
-            is_missing,
-            is_unseen,
-            is_nominal,
+            _boolebm(is_missing),
+            _boolebm(is_unseen),
+            _boolebm(is_nominal),
             len(bin_indexes),
             Native._make_pointer(bin_indexes, np.int64),
             dataset.nbytes,