diff --git a/README.md b/README.md
index b1458bb..f667c2f 100644
--- a/README.md
+++ b/README.md
@@ -42,7 +42,7 @@ To use it in your Mix projects, first add it as a dependency:
 
 ```elixir
 def deps do
-  [{:logger_logstash_backend, "~> 0.1.3"}]
+  [{:logger_logstash_backend, "~> 0.1.4"}]
 end
 ```
 Then run mix deps.get to install it.
diff --git a/lib/logger_logstash_backend.ex b/lib/logger_logstash_backend.ex
index 80d4ae1..df8c43a 100644
--- a/lib/logger_logstash_backend.ex
+++ b/lib/logger_logstash_backend.ex
@@ -61,7 +61,7 @@ defmodule LoggerLogstashBackend do
     Application.put_env :logger, name, opts
 
     level = Keyword.get opts, :level, :debug
-    metadata = Keyword.get opts, :metadata, %{}
+    metadata = Keyword.get opts, :metadata, []
     type = Keyword.get opts, :type, "elixir"
     host = Keyword.get opts, :host
     port = Keyword.get opts, :port
diff --git a/mix.exs b/mix.exs
index 3342526..e458c2b 100644
--- a/mix.exs
+++ b/mix.exs
@@ -5,7 +5,7 @@ defmodule LoggerLogstashBackend.Mixfile do
     [app: :logger_logstash_backend,
      name: "logger_logstash_backend",
      source_url: "https://github.com/marcelog/logger_logstash_backend",
-     version: "0.1.3",
+     version: "0.1.4",
      elixir: "> 1.0.0",
      description: description,
      package: package,