diff --git a/weasyprint/pdf/stream.py b/weasyprint/pdf/stream.py
index 518d5d3f1c..3b6059b9d0 100644
--- a/weasyprint/pdf/stream.py
+++ b/weasyprint/pdf/stream.py
@@ -423,7 +423,7 @@ def add_image(self, pillow_image, image_rendering, optimize_size):
         })
 
         optimize = 'images' in optimize_size
-        if pillow_image.format == 'JPEG':
+        if pillow_image.format in ('JPEG', 'MPO'):
             extra['Filter'] = '/DCTDecode'
             image_file = io.BytesIO()
             pillow_image.save(image_file, format='JPEG', optimize=optimize)