diff --git a/lib/supplejack/config.rb b/lib/supplejack/config.rb
index befb41e..6dbcc63 100644
--- a/lib/supplejack/config.rb
+++ b/lib/supplejack/config.rb
@@ -52,6 +52,7 @@ module Config
       facets
       facets_per_page
       facets_sort
+      facet_missing
       fields
       label_tag
       label_class
diff --git a/lib/supplejack/url_formats/item_hash.rb b/lib/supplejack/url_formats/item_hash.rb
index a936108..e7ac244 100644
--- a/lib/supplejack/url_formats/item_hash.rb
+++ b/lib/supplejack/url_formats/item_hash.rb
@@ -28,6 +28,7 @@ def to_api_hash
         hash[:facets]           = params[:facets] if params[:facets].present?
         hash[:facet_pivots]     = params[:facet_pivots] if params[:facet_pivots].present?
         hash[:facets_per_page]  = params[:facets_per_page].to_i if params[:facets_per_page].present?
+        hash[:facet_missing]    = params[:facet_missing] if params[:facet_missing].present?
         hash[:fields]           = params[:fields] || Supplejack.fields.join(',')
         hash[:query_fields]     = query_fields if query_fields
         hash[:solr_query]       = params[:solr_query] if params[:solr_query].present?