diff --git a/GPy/plotting/gpy_plot/plot_util.py b/GPy/plotting/gpy_plot/plot_util.py
index 0e7dc651..51d05081 100644
--- a/GPy/plotting/gpy_plot/plot_util.py
+++ b/GPy/plotting/gpy_plot/plot_util.py
@@ -142,7 +142,7 @@ def scatter_label_generator(labels, X, input_1, input_2=None, marker=None):
                 this_label = ul
                 
         if marker is not None:
-            m = marker.next()
+            m = next(marker)
 
         index = np.nonzero(labels == ul)[0]
         
diff --git a/GPy/testing/plotting_tests/baseline/gp_2d_data.png b/GPy/testing/plotting_tests/baseline/gp_2d_data.png
new file mode 100644
index 00000000..e16283d4
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diff --git a/GPy/testing/plotting_tests/baseline/gp_2d_mean.png b/GPy/testing/plotting_tests/baseline/gp_2d_mean.png
new file mode 100644
index 00000000..2b9161be
Binary files /dev/null and b/GPy/testing/plotting_tests/baseline/gp_2d_mean.png differ
diff --git a/GPy/testing/plotting_tests/baseline/gp_3d_data.png b/GPy/testing/plotting_tests/baseline/gp_3d_data.png
new file mode 100644
index 00000000..0bbf7173
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diff --git a/GPy/testing/plotting_tests/baseline/gp_3d_mean.png b/GPy/testing/plotting_tests/baseline/gp_3d_mean.png
new file mode 100644
index 00000000..df7fddb9
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