diff --git a/lib/asciinema/file_store.ex b/lib/asciinema/file_store.ex
index cf00ee2..56c71a3 100644
--- a/lib/asciinema/file_store.ex
+++ b/lib/asciinema/file_store.ex
@@ -6,17 +6,17 @@ defmodule Asciinema.FileStore do
   @callback serve_file(conn :: %Plug.Conn{}, path :: String.t, filename :: String.t) :: %Plug.Conn{}
 
   @doc "Opens the given path in store"
-  @callback open(path :: String.t) :: {:ok, File.io_device} | {:error, File.posix}
+  @callback open_file(path :: String.t) :: {:ok, File.io_device} | {:error, File.posix}
 
   @doc "Opens the given path in store, executes given fn and closes the file"
-  @callback open(path :: String.t, function :: (File.io_device -> res)) :: {:ok, res} | {:error, File.posix} when res: var
+  @callback open_file(path :: String.t, function :: (File.io_device -> res)) :: {:ok, res} | {:error, File.posix} when res: var
 
   def put_file(dst_path, src_local_path, content_type) do
     instance().put_file(dst_path, src_local_path, content_type)
   end
 
   def open_file(path, f) do
-    instance().open(path, f)
+    instance().open_file(path, f)
   end
 
   def download_file(store_path, local_path) do
diff --git a/lib/asciinema/file_store/local.ex b/lib/asciinema/file_store/local.ex
index 69225d1..4cdce4e 100644
--- a/lib/asciinema/file_store/local.ex
+++ b/lib/asciinema/file_store/local.ex
@@ -29,10 +29,10 @@ defmodule Asciinema.FileStore.Local do
     |> halt
   end
 
-  def open(path) do
+  def open_file(path) do
     File.open(base_path() <> path, [:binary, :read])
   end
-  def open(path, function) do
+  def open_file(path, function) do
     File.open(base_path() <> path, [:binary, :read], function)
   end
 
diff --git a/lib/asciinema/file_store/s3.ex b/lib/asciinema/file_store/s3.ex
index fac1d78..42d6c4c 100644
--- a/lib/asciinema/file_store/s3.ex
+++ b/lib/asciinema/file_store/s3.ex
@@ -25,7 +25,7 @@ defmodule Asciinema.FileStore.S3 do
     |> redirect(external: url)
   end
 
-  def open(path, function \\ nil) do
+  def open_file(path, function \\ nil) do
     response = S3.get_object(bucket(), base_path() <> path) |> ExAws.request(region: region())
     # TODO: use make_request
 
diff --git a/lib/asciinema/png_generator/a2png.ex b/lib/asciinema/png_generator/a2png.ex
index 66bc65d..0cccd9e 100644
--- a/lib/asciinema/png_generator/a2png.ex
+++ b/lib/asciinema/png_generator/a2png.ex
@@ -65,7 +65,7 @@ defmodule Asciinema.PngGenerator.A2png do
       Integer.to_string(png_params.scale)
     ]
 
-    {:ok, {:ok, _}} = file_store().open(path, &(:file.copy(&1, json_path)))
+    :ok = file_store().download_file(path, json_path)
     process = Porcelain.spawn(bin_path(), args, err: :string)
 
     case Porcelain.Process.await(process, @a2png_timeout) do