diff --git a/healsparse/geom.py b/healsparse/geom.py
index 93ef221..d22424f 100644
--- a/healsparse/geom.py
+++ b/healsparse/geom.py
@@ -136,6 +136,8 @@ def get_map(self, *, nside_coverage, nside_sparse, dtype, wide_mask_maxbits=None
         x = np.zeros(1, dtype=dtype)
         if is_integer_value(x[0]):
             sentinel = 0
+        elif dtype == np.bool_:
+            sentinel = False
         else:
             sentinel = hpg.UNSEEN
 
diff --git a/tests/test_geom.py b/tests/test_geom.py
index 8242520..de1018a 100644
--- a/tests/test_geom.py
+++ b/tests/test_geom.py
@@ -323,6 +323,16 @@ def test_polygon_values(self):
         testing.assert_array_equal(smap.valid_pixels, smap2.valid_pixels)
         testing.assert_array_equal(smap2.get_values_pix(smap2.valid_pixels), 2.0)
 
+        # Test booleans
+        poly = Polygon(
+            ra=ra,
+            dec=dec,
+            value=True,
+        )
+        smap3 = poly.get_map(nside_coverage=32, nside_sparse=nside, dtype=np.bool_)
+        testing.assert_array_equal(smap.valid_pixels, smap3.valid_pixels)
+        testing.assert_array_equal(smap3.get_values_pix(smap3.valid_pixels), True)
+
     def test_polygon_nside_render(self):
         """Test using a polygon with a different rendering nside."""
         nside = 2**17