diff --git a/wagtail/wagtailimages/models.py b/wagtail/wagtailimages/models.py
index 755e1fc2a..bc14a22e1 100644
--- a/wagtail/wagtailimages/models.py
+++ b/wagtail/wagtailimages/models.py
@@ -307,7 +307,12 @@ class Filter(models.Model):
             for operation in self.operations:
                 operation.run(willow, image)
 
-            willow.save(willow.original_format, output)
+            if willow.original_format == 'jpeg':
+                # Allow changing of JPEG compression quality
+                quality = getattr(settings, 'WAGTAILIMAGES_JPEG_COMPRESSION_QUALITY', 85)
+                willow.save_as_jpeg(output, quality=quality)
+            else:
+                willow.save(willow.original_format, output)
 
         return output