diff --git a/lib/sms_blitz/adapters/nexmo.ex b/lib/sms_blitz/adapters/nexmo.ex
index caded72..dcb0f70 100644
--- a/lib/sms_blitz/adapters/nexmo.ex
+++ b/lib/sms_blitz/adapters/nexmo.ex
@@ -21,13 +21,13 @@ defmodule SmsBlitz.Adapters.Nexmo do
       api_secret: secret
     } |> Poison.encode!
 
-    {:ok, %{headers: headers, body: resp, status_code: status_code}} = HTTPoison.post(
+    {:ok, %{headers: headers, body: resp, status_code: _status_code}} = HTTPoison.post(
       uri,
       body,
       [{"Content-Type", "application/json"}]
     )
 
-    {:ok, %{"message-count" => msg_count, "messages" => [response_status]}} = Poison.decode(resp)
+    {:ok, %{"message-count" => _msg_count, "messages" => [response_status]}} = Poison.decode(resp)
 
     if response_status["status"] == "0" do
       %{
@@ -38,8 +38,8 @@ defmodule SmsBlitz.Adapters.Nexmo do
     else
 
       {_key, trace_id} = Enum.find(headers, fn
-          ({"X-Nexmo-Trace-Id", value}) -> true
-          (_)                           -> false
+          ({"X-Nexmo-Trace-Id", _value}) -> true
+          (_)                            -> false
         end)
 
       %{
diff --git a/mix.exs b/mix.exs
index e112a89..1929aad 100644
--- a/mix.exs
+++ b/mix.exs
@@ -10,12 +10,12 @@ defmodule SmsBlitz.Mixfile do
      start_permanent: Mix.env == :prod,
      deps: deps(Mix.env),
      test_coverage: [tool: ExCoveralls],
-     preferred_cli_env: ["coveralls": :test, "coveralls.detail": :test, "coveralls.post": :test],
-     package: package]
+     preferred_cli_env: [coveralls: :test, "coveralls.detail": :test, "coveralls.post": :test],
+     package: package()]
   end
 
   def application do
-    [applications: [:logger, :httpoison]]
+    [applications: [:logger, :httpoison, :poison]]
   end
 
   defp deps(:test) do