diff --git a/app/controllers/iqdb_queries_controller.rb b/app/controllers/iqdb_queries_controller.rb
index 537327e01..1bf36bc86 100644
--- a/app/controllers/iqdb_queries_controller.rb
+++ b/app/controllers/iqdb_queries_controller.rb
@@ -3,7 +3,7 @@ class IqdbQueriesController < ApplicationController
 
   def show
     # XXX allow bare search params for backwards compatibility.
-    search_params.merge!(params.slice(:url, :post_id, :limit, :similarity, :high_similarity).permit!)
+    search_params.merge!(params.slice(:url, :image_url, :post_id, :limit, :similarity, :high_similarity).permit!)
 
     @high_similarity_matches, @low_similarity_matches, @matches = IqdbProxy.search(search_params)
     respond_with(@matches, template: "iqdb_queries/show")