diff --git a/pygmt/tests/test_datasets_earth_mean_sea_surface.py b/pygmt/tests/test_datasets_earth_mean_sea_surface.py
index c93b180936c..7206cbf911f 100644
--- a/pygmt/tests/test_datasets_earth_mean_sea_surface.py
+++ b/pygmt/tests/test_datasets_earth_mean_sea_surface.py
@@ -18,7 +18,7 @@ def test_earth_mss_01d():
     assert data.attrs["units"] == "meters"
     assert data.attrs["horizontal_datum"] == "WGS84"
     assert data.shape == (181, 361)
-    assert data.gmt.registration == GridRegistration.Gridline
+    assert data.gmt.registration == GridRegistration.GRIDLINE
     npt.assert_allclose(data.lat, np.arange(-90, 91, 1))
     npt.assert_allclose(data.lon, np.arange(-180, 181, 1))
     npt.assert_allclose(data.min(), -104.71, atol=0.01)
@@ -31,7 +31,7 @@ def test_earth_mss_01d_with_region():
     """
     data = load_earth_mean_sea_surface(resolution="01d", region=[-10, 10, -5, 5])
     assert data.shape == (11, 21)
-    assert data.gmt.registration == GridRegistration.Gridline
+    assert data.gmt.registration == GridRegistration.GRIDLINE
     npt.assert_allclose(data.lat, np.arange(-5, 6, 1))
     npt.assert_allclose(data.lon, np.arange(-10, 11, 1))
     npt.assert_allclose(data.min(), 6.53, atol=0.01)
@@ -45,7 +45,7 @@ def test_earth_mss_01m_default_registration():
     """
     data = load_earth_mean_sea_surface(resolution="01m", region=[-10, -9, 3, 5])
     assert data.shape == (121, 61)
-    assert data.gmt.registration == GridRegistration.Gridline
+    assert data.gmt.registration == GridRegistration.GRIDLINE
     assert data.coords["lat"].data.min() == 3.0
     assert data.coords["lat"].data.max() == 5.0
     assert data.coords["lon"].data.min() == -10.0
diff --git a/pygmt/tests/test_datasets_mean_dynamic_topography.py b/pygmt/tests/test_datasets_mean_dynamic_topography.py
index 2a8480a4ee7..c373b727e79 100644
--- a/pygmt/tests/test_datasets_mean_dynamic_topography.py
+++ b/pygmt/tests/test_datasets_mean_dynamic_topography.py
@@ -18,7 +18,7 @@ def test_earth_mdt_01d():
     assert data.attrs["units"] == "meters"
     assert data.attrs["horizontal_datum"] == "WGS84"
     assert data.shape == (181, 361)
-    assert data.gmt.registration == GridRegistration.Gridline
+    assert data.gmt.registration == GridRegistration.GRIDLINE
     npt.assert_allclose(data.lat, np.arange(-90, 91, 1))
     npt.assert_allclose(data.lon, np.arange(-180, 181, 1))
     npt.assert_allclose(data.min(), -1.4668, atol=0.0001)
@@ -31,7 +31,7 @@ def test_earth_mdt_01d_with_region():
     """
     data = load_earth_mean_dynamic_topography(resolution="01d", region=[-10, 10, -5, 5])
     assert data.shape == (11, 21)
-    assert data.gmt.registration == GridRegistration.Gridline
+    assert data.gmt.registration == GridRegistration.GRIDLINE
     npt.assert_allclose(data.lat, np.arange(-5, 6, 1))
     npt.assert_allclose(data.lon, np.arange(-10, 11, 1))
     npt.assert_allclose(data.min(), 0.346, atol=0.0001)
@@ -45,7 +45,7 @@ def test_earth_mdt_07m_default_registration():
     """
     data = load_earth_mean_dynamic_topography(resolution="07m", region=[-10, -9, 3, 5])
     assert data.shape == (17, 9)
-    assert data.gmt.registration == GridRegistration.Gridline
+    assert data.gmt.registration == GridRegistration.GRIDLINE
     assert data.coords["lat"].data.min() == 3.0
     assert data.coords["lat"].data.max() == 5.0
     assert data.coords["lon"].data.min() == -10.0