diff --git a/masque/builder/utils.py b/masque/builder/utils.py
index 5680694..b64cb85 100644
--- a/masque/builder/utils.py
+++ b/masque/builder/utils.py
@@ -84,7 +84,7 @@ def ell(
         raise BuildError('Empty port list passed to `ell()`')
 
     if ccw is None:
-        if spacing is not None and not numpy.isclose(spacing, 0):
+        if spacing is not None and not numpy.allclose(spacing, 0):
             raise BuildError('Spacing must be 0 or None when ccw=None')
         spacing = 0
     elif spacing is None:
diff --git a/masque/test/test_builder.py b/masque/test/test_builder.py
index 0ad6e80..0553b75 100644
--- a/masque/test/test_builder.py
+++ b/masque/test/test_builder.py
@@ -129,3 +129,17 @@ def test_dead_plug_best_effort() -> None:
     # P2 rot pi + transform rot -pi = 0
     assert b.ports['B'].rotation is not None
     assert_allclose(b.ports['B'].rotation, 0, atol=1e-10)
+
+
+def test_ell_handles_array_spacing_when_ccw_none() -> None:
+    ports = {
+        'A': Port((0, 0), 0),
+        'B': Port((0, 1), 0),
+    }
+
+    scalar = ell(ports, None, 'min_extension', 5, spacing=0)
+    array_zero = ell(ports, None, 'min_extension', 5, spacing=numpy.array([0, 0]))
+    assert scalar == array_zero
+
+    with pytest.raises(BuildError, match='Spacing must be 0 or None'):
+        ell(ports, None, 'min_extension', 5, spacing=numpy.array([1, 0]))