diff --git a/examples/02_kriging3D.py b/examples/02_kriging3D.py
index 7cf14ea..09438db 100755
--- a/examples/02_kriging3D.py
+++ b/examples/02_kriging3D.py
@@ -98,7 +98,7 @@
 ax2.set_title("regional lin. drift")
 ax3.imshow(k3d3[:, :, 0], origin="lower")
 ax3.set_title("specified drift")
-ax4.imshow(k3d3[:, :, 0], origin="lower")
+ax4.imshow(k3d4[:, :, 0], origin="lower")
 ax4.set_title("functional drift")
 plt.tight_layout()
 plt.show()