diff --git a/doc/examples/plot_local_binary_pattern.py b/doc/examples/plot_local_binary_pattern.py
index 98ea08d4..c97a792d 100644
--- a/doc/examples/plot_local_binary_pattern.py
+++ b/doc/examples/plot_local_binary_pattern.py
@@ -207,7 +207,7 @@ plt.gray()
 
 ax1.imshow(brick)
 ax1.axis('off')
-hist(ax, refs['brick'])
+hist(ax4, refs['brick'])
 ax4.set_ylabel('Percentage')
 
 ax2.imshow(grass)