diff --git a/doc/examples/filters/plot_denoise.py b/doc/examples/filters/plot_denoise.py
index 9978b818..810aa7e3 100644
--- a/doc/examples/filters/plot_denoise.py
+++ b/doc/examples/filters/plot_denoise.py
@@ -52,7 +52,8 @@ ax[0, 1].set_title('TV')
 ax[0, 2].imshow(denoise_bilateral(noisy, sigma_color=0.05, sigma_spatial=15))
 ax[0, 2].axis('off')
 ax[0, 2].set_title('Bilateral')
-ax[0, 3].imshow(denoise_wavelet(noisy, sigma=0.4*astro.std()))
+ax[0, 3].imshow(denoise_wavelet(noisy, sigma=0.4*astro.std(),
+                                multichannel=True))
 ax[0, 3].axis('off')
 ax[0, 3].set_title('Wavelet')
 
@@ -62,7 +63,8 @@ ax[1, 1].set_title('(more) TV')
 ax[1, 2].imshow(denoise_bilateral(noisy, sigma_color=0.1, sigma_spatial=15))
 ax[1, 2].axis('off')
 ax[1, 2].set_title('(more) Bilateral')
-ax[1, 3].imshow(denoise_wavelet(noisy, sigma=0.6*astro.std()))
+ax[1, 3].imshow(denoise_wavelet(noisy, sigma=0.6*astro.std(),
+                                multichannel=True))
 ax[1, 3].axis('off')
 ax[1, 3].set_title('(more) Wavelet')
 ax[1, 0].imshow(astro)