diff --git a/lib/mongo/grid_fs/bucket.ex b/lib/mongo/grid_fs/bucket.ex
index 38d087db..13600557 100644
--- a/lib/mongo/grid_fs/bucket.ex
+++ b/lib/mongo/grid_fs/bucket.ex
@@ -122,16 +122,15 @@ defmodule Mongo.GridFs.Bucket do
   end
 
   @doc """
-  Finds one file document with the file_id as a string
+  Finds one file document by `file_id` specified either as a string or `BSON.ObjectId`.
   """
+  def find_one(bucket, file_id)
+
   @spec find_one(Bucket.t, String.t) :: BSON.document | nil
   def find_one(%Bucket{} = bucket, file_id) when is_binary(file_id) do
     find_one(bucket, ObjectId.decode!(file_id))
   end
 
-  @doc """
-  Finds one file document with the file_id as an ObjectID-struct
-  """
   @spec find_one(Bucket.t, BSON.ObjectId.t) :: BSON.document | nil
   def find_one(%Bucket{topology_pid: topology_pid, opts: opts} = bucket, %BSON.ObjectId{} = oid) do
      Mongo.find_one(topology_pid, files_collection_name(bucket), %{"_id" => oid}, opts)
diff --git a/mix.exs b/mix.exs
index 84db9e46..d45aa82c 100644
--- a/mix.exs
+++ b/mix.exs
@@ -28,9 +28,12 @@ defmodule Mongodb.Mixfile do
   defp elixirc_paths(_),     do: ["lib"]
 
   def application() do
-    [applications: applications(Mix.env),
-     mod: {Mongo.App, []},
-     env: []]
+    [
+      applications: applications(Mix.env),
+      env: [],
+      extra_applications: [:crypto, :ssl],
+      mod: {Mongo.App, []}
+    ]
   end
 
   def applications(:test), do: [:logger, :connection, :db_connection]