diff --git a/concrete/numpy/np_dtypes_helpers.py b/concrete/numpy/np_dtypes_helpers.py
index e974bc8ab..dc5a0d3bf 100644
--- a/concrete/numpy/np_dtypes_helpers.py
+++ b/concrete/numpy/np_dtypes_helpers.py
@@ -27,7 +27,7 @@ NUMPY_TO_COMMON_DTYPE_MAPPING: Dict[numpy.dtype, BaseDataType] = {
     numpy.dtype(numpy.uint64): Integer(64, is_signed=False),
     numpy.dtype(numpy.float32): Float(32),
     numpy.dtype(numpy.float64): Float(64),
-    numpy.dtype(bool): Integer(32, is_signed=False),
+    numpy.dtype(bool): Integer(8, is_signed=False),
 }
 
 SUPPORTED_NUMPY_DTYPES = tuple(NUMPY_TO_COMMON_DTYPE_MAPPING)
diff --git a/tests/numpy/test_tracing.py b/tests/numpy/test_tracing.py
index 0b9b4c42b..2ffca1a90 100644
--- a/tests/numpy/test_tracing.py
+++ b/tests/numpy/test_tracing.py
@@ -314,6 +314,7 @@ def test_trace_numpy_supported_ufuncs(inputs, expected_output_node):
             assert op_graph.output_nodes[0].outputs[0] == EncryptedScalar(Float(64))
         else:
             assert op_graph.output_nodes[0].outputs[0] in [
+                EncryptedScalar(Integer(8, is_signed=False)),
                 EncryptedScalar(Integer(32, is_signed=False)),
                 EncryptedScalar(Integer(32, is_signed=True)),
                 EncryptedScalar(Integer(64, is_signed=True)),