diff --git a/app/controllers/post_replacements_controller.rb b/app/controllers/post_replacements_controller.rb
index b9bd22984..d0c95cc8d 100644
--- a/app/controllers/post_replacements_controller.rb
+++ b/app/controllers/post_replacements_controller.rb
@@ -23,6 +23,6 @@ class PostReplacementsController < ApplicationController
 
 private
   def create_params
-    params.require(:post_replacement).permit(:replacement_url)
+    params.require(:post_replacement).permit(:replacement_url, :final_source)
   end
 end
diff --git a/app/models/post_replacement.rb b/app/models/post_replacement.rb
index 6eea498e5..1346f631c 100644
--- a/app/models/post_replacement.rb
+++ b/app/models/post_replacement.rb
@@ -4,7 +4,8 @@ class PostReplacement < ApplicationRecord
   belongs_to :post
   belongs_to :creator, class_name: "User"
   before_validation :initialize_fields
-  attr_accessible :replacement_url
+  attr_accessible :replacement_url, :final_source
+  attr_accessor :final_source
 
   def initialize_fields
     self.creator = CurrentUser.user
@@ -37,7 +38,7 @@ class PostReplacement < ApplicationRecord
       post.image_width = upload.image_width
       post.image_height = upload.image_height
       post.file_size = upload.file_size
-      post.source = upload.source
+      post.source = final_source.presence || upload.source
       post.tag_string = upload.tag_string
       rescale_notes
       update_ugoira_frame_data(upload)
diff --git a/app/views/post_replacements/_new.html.erb b/app/views/post_replacements/_new.html.erb
index d226ca26d..a80dfce44 100644
--- a/app/views/post_replacements/_new.html.erb
+++ b/app/views/post_replacements/_new.html.erb
@@ -1,5 +1,6 @@
 <%= format_text(WikiPage.titled(Danbooru.config.replacement_notice_wiki_page).first.try(&:body), ragel: true) %>
 
 <%= simple_form_for(post_replacement, url: post_replacements_path(post_id: post_replacement.post_id), method: :post) do |f| %>
-  <%= f.input :replacement_url, label: "New Source", input_html: { value: "" } %>
+  <%= f.input :replacement_url, label: "Replacement URL", hint: "The source URL to download the replacement from.", as: :string, input_html: { value: post_replacement.post.normalized_source } %>
+  <%= f.input :final_source, label: "Final Source", hint: "If present, the source field will be changed to this after replacement.", as: :string, input_html: { value: post_replacement.post.source } %>
 <% end %>
diff --git a/test/unit/post_replacement_test.rb b/test/unit/post_replacement_test.rb
index 23c48bd7e..bdc6017a2 100644
--- a/test/unit/post_replacement_test.rb
+++ b/test/unit/post_replacement_test.rb
@@ -190,5 +190,15 @@ class PostReplacementTest < ActiveSupport::TestCase
         assert(File.exists?(@post.large_file_path))
       end
     end
+
+    context "a post when given a final_source" do
+      should "change the source to the final_source" do
+        replacement_url = "http://data.tumblr.com/afed9f5b3c33c39dc8c967e262955de2/tumblr_orwwptNBCE1wsfqepo1_raw.png"
+        final_source = "https://noizave.tumblr.com/post/162094447052"
+        @post.replace!(replacement_url: replacement_url, final_source: final_source)
+
+        assert_equal(final_source, @post.source)
+      end
+    end
   end
 end