diff --git a/GPy/plotting/matplot_dep/kernel_plots.py b/GPy/plotting/matplot_dep/kernel_plots.py
index 1e15f224..cbf0fa54 100644
--- a/GPy/plotting/matplot_dep/kernel_plots.py
+++ b/GPy/plotting/matplot_dep/kernel_plots.py
@@ -161,7 +161,8 @@ def plot(kernel,x=None, fignum=None, ax=None, title=None, plot_limits=None, reso
         Xnew = np.vstack((xx.flatten(), yy.flatten())).T
         Kx = kernel.K(Xnew, x)
         Kx = Kx.reshape(resolution, resolution).T
-        ax.contour(xx, xx, Kx, vmin=Kx.min(), vmax=Kx.max(), cmap=pb.cm.jet, **mpl_kwargs) # @UndefinedVariable
+        stop
+        ax.contour(xx, yy, Kx, vmin=Kx.min(), vmax=Kx.max(), cmap=pb.cm.jet, **mpl_kwargs) # @UndefinedVariable
         ax.set_xlim(xmin[0], xmax[0])
         ax.set_ylim(xmin[1], xmax[1])
         ax.set_xlabel("x1")