diff --git a/.formatter.exs b/.formatter.exs
new file mode 100644
index 0000000..d2cda26
--- /dev/null
+++ b/.formatter.exs
@@ -0,0 +1,4 @@
+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]
diff --git a/config/config.exs b/config/config.exs
index 718408d..670bb5f 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -2,4 +2,4 @@ use Mix.Config
 
 config :snowflake,
   nodes: ["127.0.0.1"],
-  epoch: 1473562509301
+  epoch: 1_473_562_509_301
diff --git a/lib/snowflake.ex b/lib/snowflake.ex
index a8ba8b5..eec1e83 100644
--- a/lib/snowflake.ex
+++ b/lib/snowflake.ex
@@ -18,8 +18,9 @@ defmodule Snowflake do
   Generates a snowflake ID, each call is guaranteed to return a different ID
   that is sequantially larger than the previous ID.
   """
-  @spec next_id() :: {:ok, integer} |
-                     {:error, :backwards_clock}
+  @spec next_id() ::
+          {:ok, integer}
+          | {:error, :backwards_clock}
   def next_id() do
     GenServer.call(Snowflake.Generator, :next_id)
   end
diff --git a/lib/snowflake/generator.ex b/lib/snowflake/generator.ex
index 1c82f3e..be40f01 100644
--- a/lib/snowflake/generator.ex
+++ b/lib/snowflake/generator.ex
@@ -19,8 +19,10 @@ defmodule Snowflake.Generator do
       {:error, :seq_overflow} ->
         :timer.sleep(1)
         handle_call(:next_id, from, state)
+
       {:error, :backwards_clock} ->
         {:reply, {:error, :backwards_clock}, state}
+
       {:ok, new_ts, new_seq} ->
         new_state = {epoch, new_ts, machine_id, new_seq}
         {:reply, {:ok, create_id(new_ts, machine_id, new_seq)}, new_state}
@@ -42,6 +44,7 @@ defmodule Snowflake.Generator do
           @seq_overflow -> {:error, :seq_overflow}
           next_seq -> {:ok, prev_ts, next_seq}
         end
+
       new_ts ->
         cond do
           new_ts < prev_ts -> {:error, :backwards_clock}
@@ -51,10 +54,11 @@ defmodule Snowflake.Generator do
   end
 
   defp create_id(ts, machine_id, seq) do
-    << new_id :: unsigned-integer-size(64)>> = <<
-       ts :: unsigned-integer-size(42),
-       machine_id :: unsigned-integer-size(10),
-       seq :: unsigned-integer-size(12) >>
+    <<new_id::unsigned-integer-size(64)>> = <<
+      ts::unsigned-integer-size(42),
+      machine_id::unsigned-integer-size(10),
+      seq::unsigned-integer-size(12)
+    >>
 
     new_id
   end
diff --git a/lib/snowflake/helper.ex b/lib/snowflake/helper.ex
index fd241d5..861dea4 100644
--- a/lib/snowflake/helper.ex
+++ b/lib/snowflake/helper.ex
@@ -40,7 +40,7 @@ defmodule Snowflake.Helper do
   defp machine_id(_id), do: machine_id(nil)
 
   defp ip_addrs() do
-    case :inet.getifaddrs do
+    case :inet.getifaddrs() do
       {:ok, ifaddrs} ->
         ifaddrs
         |> Enum.flat_map(fn {_, kwlist} ->
@@ -49,11 +49,15 @@ defmodule Snowflake.Helper do
         |> Enum.filter(&(tuple_size(elem(&1, 1)) in [4, 6]))
         |> Enum.map(fn {_, addr} ->
           case addr do
-            {a, b, c, d} -> [a, b, c, d] |> Enum.join(".")              # ipv4
-            {a, b, c, d, e, f} -> [a, b, c, d, e, f] |> Enum.join(":")  # ipv6
+            # ipv4
+            {a, b, c, d} -> [a, b, c, d] |> Enum.join(".")
+            # ipv6
+            {a, b, c, d, e, f} -> [a, b, c, d, e, f] |> Enum.join(":")
           end
         end)
-      _ -> []
+
+      _ ->
+        []
     end
   end
 
@@ -63,7 +67,7 @@ defmodule Snowflake.Helper do
   end
 
   defp fqdn() do
-    case :inet.get_rc[:domain] do
+    case :inet.get_rc()[:domain] do
       nil -> nil
       domain -> hostname() <> "." <> to_string(domain)
     end
diff --git a/lib/snowflake/util.ex b/lib/snowflake/util.ex
index b9ede10..ae09c87 100644
--- a/lib/snowflake/util.ex
+++ b/lib/snowflake/util.ex
@@ -16,11 +16,12 @@ defmodule Snowflake.Util do
   @spec first_snowflake_for_timestamp(integer) :: integer
   def first_snowflake_for_timestamp(timestamp) do
     ts = timestamp - Snowflake.Helper.epoch()
-    
-    << new_id :: unsigned-integer-size(64)>> = <<
-       ts :: unsigned-integer-size(42),
-       0 :: unsigned-integer-size(10),
-       0 :: unsigned-integer-size(12) >>
+
+    <<new_id::unsigned-integer-size(64)>> = <<
+      ts::unsigned-integer-size(42),
+      0::unsigned-integer-size(10),
+      0::unsigned-integer-size(12)
+    >>
 
     new_id
   end
@@ -61,7 +62,8 @@ defmodule Snowflake.Util do
   defp bucket_size(unit_type, units) do
     case unit_type do
       :hours -> 1000 * 60 * 60 * units
-      _ -> 1000 * 60 * 60 * 24 * units  # days is default
+      # days is default
+      _ -> 1000 * 60 * 60 * 24 * units
     end
   end
 end
diff --git a/mix.exs b/mix.exs
index 5434bcb..bebe710 100644
--- a/mix.exs
+++ b/mix.exs
@@ -11,8 +11,8 @@ defmodule Snowflake.Mixfile do
       app: :snowflake,
       version: @version,
       source_url: @url,
-      build_embedded: Mix.env == :prod,
-      start_permanent: Mix.env == :prod,
+      build_embedded: Mix.env() == :prod,
+      start_permanent: Mix.env() == :prod,
       maintainers: @maintainers,
       description: "Elixir Snowflake ID Generator",
       elixir: "~> 1.3",
@@ -24,8 +24,7 @@ defmodule Snowflake.Mixfile do
   end
 
   def application do
-    [applications: [],
-     mod: {Snowflake, []}]
+    [applications: [], mod: {Snowflake, []}]
   end
 
   defp deps do