diff --git a/smmregrid/checker.py b/smmregrid/checker.py
index c9659b9..76cfbfd 100644
--- a/smmregrid/checker.py
+++ b/smmregrid/checker.py
@@ -47,10 +47,10 @@ def check_cdo_regrid(finput, ftarget, remap_method='con', access='Dataset',
     smmvar = find_var(xfield)
     cdovar = find_var(cdofield)
 
-    if len(smmvar) == 1 and access == 'DataArray':
-        xfield = xfield[smmvar[0]]
-    if len(cdovar) == 1 and access == 'DataArray':
-        cdofield = cdofield[cdovar[0]]
+    #if len(smmvar) == 1 and access == 'DataArray':
+    #    xfield = xfield[smmvar[0]]
+    #if len(cdovar) == 1 and access == 'DataArray':
+    #    cdofield = cdofield[cdovar[0]]
 
     # interpolation with smmregrid (CDO-based)
     # method with creation of weights
@@ -98,10 +98,10 @@ def check_cdo_regrid_levels(finput, ftarget, vertical_dim, levels, remap_method=
     smmvar = find_var(xfield)
     cdovar = find_var(cdofield)
 
-    if len(smmvar) == 1 and access == 'DataArray':
-        xfield = xfield[smmvar[0]]
-    if len(cdovar) == 1 and access == 'DataArray':
-        cdofield = cdofield[cdovar[0]]
+    #if len(smmvar) == 1 and access == 'DataArray':
+    #    xfield = xfield[smmvar[0]]
+    #if len(cdovar) == 1 and access == 'DataArray':
+    #    cdofield = cdofield[cdovar[0]]
 
     # compute weights
     if vertical_dim == 'plev':
diff --git a/tests/basic_test.py b/tests/basic_test.py
index 0fa5706..142c8c0 100644
--- a/tests/basic_test.py
+++ b/tests/basic_test.py
@@ -31,6 +31,6 @@ def test_nan_preserve(method):
     xfield = xarray.open_mfdataset(os.path.join(INDIR, 'tas-ecearth.nc'))
     xfield['tas'][1,:,:] = numpy.nan
     wfield = cdo_generate_weights(xfield, tfile, method = method, loglevel='debug')
-    interpolator = Regridder(weights=wfield, loglevel='debug')
+    interpolator = Regridder(weights=wfield, space_dims='pippo', loglevel='debug')
     rfield = interpolator.regrid(xfield)
     assert numpy.isnan(rfield['tas'][1,:,:]).all().compute()