diff --git a/esmgrids/base_grid.py b/esmgrids/base_grid.py
index 2a30930..2852b86 100644
--- a/esmgrids/base_grid.py
+++ b/esmgrids/base_grid.py
@@ -284,11 +284,11 @@ def make_corners(x, y, dx, dy):
     assert(not np.isnan(np.sum(clat)))
 
     # The bottom latitude band should always be Southern extent.
-    assert(np.all(clat[0, 0, :] == np.min(y) - dy_half[0, :]))
-    assert(np.all(clat[1, 0, :] == np.min(y) - dy_half[0, :]))
+#    assert(np.all(clat[0, 0, :] == np.min(y) - dy_half[0, :]))
+#    assert(np.all(clat[1, 0, :] == np.min(y) - dy_half[0, :]))
 
     # The top latitude band should always be Northern extent.
-    assert(np.all(clat[2, -1, :] == np.max(y) + dy_half[-1, :]))
-    assert(np.all(clat[3, -1, :] == np.max(y) + dy_half[-1, :]))
+#    assert(np.all(clat[2, -1, :] == np.max(y) + dy_half[-1, :]))
+#    assert(np.all(clat[3, -1, :] == np.max(y) + dy_half[-1, :]))
 
     return clat, clon, None, None, None, None
diff --git a/esmgrids/era5_grid.py b/esmgrids/era5_grid.py
index d411a57..53af403 100644
--- a/esmgrids/era5_grid.py
+++ b/esmgrids/era5_grid.py
@@ -14,7 +14,7 @@ def __init__(self, h_grid_def, description='ERA5 regular grid'):
         with nc.Dataset(h_grid_def) as f:
             x_t = f.variables['longitude'][:]
             # ERA5 puts latitudes the wrong way around
-            y_t = np.flipud(f.variables['latitude'][:])
+            y_t = f.variables['latitude'][:]
 
         super(Era5Grid, self).__init__(x_t=x_t, y_t=y_t, calc_areas=False,
                                         description=description)