diff --git a/lib/frenzy/feed.ex b/lib/frenzy/feed.ex
index dbfda4e..bcf48b6 100644
--- a/lib/frenzy/feed.ex
+++ b/lib/frenzy/feed.ex
@@ -19,14 +19,14 @@ defmodule Frenzy.Feed do
 
   def to_fervor(feed) do
     %{
-      id: feed.id,
+      id: feed.id |> Integer.to_string(),
       title: feed.title,
       url: feed.site_url,
       feed_url: feed.feed_url,
       service_url:
         Application.get_env(:frenzy, :base_url) <> Routes.feed_path(Endpoint, :show, feed.id),
       last_updated: DateTime.to_iso8601(feed.last_updated),
-      group_ids: [feed.group_id]
+      group_ids: [feed.group_id |> Integer.to_string()]
     }
   end
 
diff --git a/lib/frenzy/group.ex b/lib/frenzy/group.ex
index 64acc92..d9abf91 100644
--- a/lib/frenzy/group.ex
+++ b/lib/frenzy/group.ex
@@ -20,9 +20,9 @@ defmodule Frenzy.Group do
 
   def to_fervor(group) do
     %{
-      id: group.id,
+      id: group.id |> Integer.to_string(),
       title: group.title,
-      feed_ids: group.feeds |> Enum.map(fn f -> f.id end),
+      feed_ids: group.feeds |> Enum.map(&Integer.to_string(&1.id)),
       service_url:
         Application.get_env(:frenzy, :base_url) <> Routes.group_path(Endpoint, :show, group.id)
     }
diff --git a/lib/frenzy/item.ex b/lib/frenzy/item.ex
index 29edf21..c34714c 100644
--- a/lib/frenzy/item.ex
+++ b/lib/frenzy/item.ex
@@ -26,8 +26,8 @@ defmodule Frenzy.Item do
 
   def to_fervor(item) do
     res = %{
-      id: item.id,
-      feed_id: item.feed_id,
+      id: item.id |> Integer.to_string(),
+      feed_id: item.feed_id |> Integer.to_string(),
       title: item.title,
       author: item.creator,
       content: item.content,