diff --git a/meta.yaml b/meta.yaml
index 2adcd35..52e4099 100644
--- a/meta.yaml
+++ b/meta.yaml
@@ -41,6 +41,7 @@ test:
         - cdo
         - esmf
         - hdf5
+        - nco
     files:
         - setup.cfg
         - test
diff --git a/src/climtas/event.py b/src/climtas/event.py
index 14478ec..32587fd 100644
--- a/src/climtas/event.py
+++ b/src/climtas/event.py
@@ -183,6 +183,7 @@ def atleastn(da: xarray.DataArray, n: int, dim: str = "time") -> xarray.DataArra
     """
 
     def atleastn_helper(array, axis, n):
+        axis = axis[0]
         count = numpy.zeros_like(numpy.take(array, 0, axis=axis), dtype="i4")
         mask = numpy.empty_like(numpy.take(array, 0, axis=axis), dtype="bool")
         mask = True
diff --git a/test/test_regrid.py b/test/test_regrid.py
index bc7d27d..a3886b9 100644
--- a/test/test_regrid.py
+++ b/test/test_regrid.py
@@ -294,10 +294,7 @@ def test_esmf_generate_weights():
 
 @pytest.mark.parametrize(
     "weight_gen,weight_args",
-    [
-        (esmf_generate_weights, {}),
-        (esmf_generate_weights, {"method": "patch"}),
-    ],
+    [(esmf_generate_weights, {}), (esmf_generate_weights, {"method": "patch"})],
 )
 def test_nco(tmpdir, weight_gen, weight_args):
     alats = 10