diff --git a/lib/jsduck/images.rb b/lib/jsduck/images.rb
index cd194015ed042ea5e056dc50dcdd32a779606a1c..4e02e81e08d4bd8794721891cb32f55d307e938e 100644
--- a/lib/jsduck/images.rb
+++ b/lib/jsduck/images.rb
@@ -35,7 +35,7 @@ module JsDuck
     def copy(output_dir)
       @images.each_key do |img|
         unless copy_img(img, output_dir)
-          Logger.instance.warn("Image #{img} not found")
+          Logger.instance.warn("Image not found.", img)
         end
       end
       report_unused
@@ -62,7 +62,7 @@ module JsDuck
     def report_unused
       @paths.each_pair do |path, map|
         map.each_pair do |img, used|
-          Logger.instance.warn("Image #{img} not used") unless used
+          Logger.instance.warn("Image not used.", img) unless used
         end
       end
     end