diff --git a/.formatter.exs b/.formatter.exs
index 525446d..9f411ac 100644
--- a/.formatter.exs
+++ b/.formatter.exs
@@ -1,4 +1,5 @@
 # Used by "mix format"
 [
-  inputs: ["mix.exs", "{config,lib,test}/**/*.{ex,exs}"]
+  inputs: ["mix.exs", "{config,lib,test}/**/*.{ex,exs}"],
+  import_deps: [:plug]
 ]
diff --git a/README.md b/README.md
index 561ba08..b998f34 100644
--- a/README.md
+++ b/README.md
@@ -30,8 +30,8 @@ If you want `PlugMicropub` to serve only a particular route, configure your rout
 forward "/micropub",
   to: PlugMicropub,
   init_opts: [
-	handler: MyApp.MicropubHandler,
-	json_encoder: Poison
+    handler: MyApp.MicropubHandler,
+    json_encoder: Poison
   ]
 ```
 
diff --git a/lib/plug_micropub.ex b/lib/plug_micropub.ex
index 6bb8ce7..4f553b8 100644
--- a/lib/plug_micropub.ex
+++ b/lib/plug_micropub.ex
@@ -7,8 +7,8 @@ defmodule PlugMicropub do
   """
   use Plug.Router
 
-  plug(:match)
-  plug(:dispatch)
+  plug :match
+  plug :dispatch
 
   # Plug Callbacks
 
@@ -64,6 +64,10 @@ defmodule PlugMicropub do
     end
   end
 
+  match _ do
+    send_error(conn, {:error, :invalid_request})
+  end
+
   # Internal Functions
 
   defp send_content(conn, content) do