diff --git a/examples/decomposition/plot_pca_iris.py b/examples/decomposition/plot_pca_iris.py
index f8451915b4412..23bf4ce510135 100644
--- a/examples/decomposition/plot_pca_iris.py
+++ b/examples/decomposition/plot_pca_iris.py
@@ -50,7 +50,8 @@
               bbox=dict(alpha=.5, edgecolor='w', facecolor='w'))
 # Reorder the labels to have colors matching the cluster results
 y = np.choose(y, [1, 2, 0]).astype(np.float)
-ax.scatter(X[:, 0], X[:, 1], X[:, 2], c=y, cmap=plt.cm.spectral)
+ax.scatter(X[:, 0], X[:, 1], X[:, 2], c=y, cmap=plt.cm.spectral,
+           edgecolor='k')
 
 ax.w_xaxis.set_ticklabels([])
 ax.w_yaxis.set_ticklabels([])