diff --git a/app/controllers/mpa_controller.rb b/app/controllers/mpa_controller.rb
index 6574889..ea99a11 100644
--- a/app/controllers/mpa_controller.rb
+++ b/app/controllers/mpa_controller.rb
@@ -30,7 +30,7 @@ def pept2data
 
     @lineages = Hash.new
     taxa.each do |taxon|
-      @lineages[taxon.id] = taxon.lineage.to_a
+      @lineages[taxon.id] = taxon.lineage.to_a_idx
     end
 
     puts @lineages.inspect
diff --git a/app/views/mpa/pept2data.json.jbuilder b/app/views/mpa/pept2data.json.jbuilder
index e129ad3..508d6f5 100644
--- a/app/views/mpa/pept2data.json.jbuilder
+++ b/app/views/mpa/pept2data.json.jbuilder
@@ -3,7 +3,7 @@ json.peptides @response do |peptide, lca|
   json.lca lca
   json.lineage @lineages[lca]
   json.fa do
-    json.counts {}
-    json.data {}
+    json.counts({})
+    json.data({})
   end
 end