diff --git a/app/.credo.exs b/app/.credo.exs
index 5638a4b..0a5f34a 100644
--- a/app/.credo.exs
+++ b/app/.credo.exs
@@ -41,7 +41,7 @@
       # If you create your own checks, you must specify the source files for
       # them here, so they can be loaded by Credo before running the analysis.
       #
-      requires: ["lib/firehose/checks/"],
+      requires: ["lib_dev/firehose/checks/"],
       #
       # If you want to enforce a style guide and need a more traditional linting
       # experience, you can change `strict` to `true` below:
diff --git a/app/lib/firehose/checks/no_conn_shadowing.ex b/app/lib_dev/firehose/checks/no_conn_shadowing.ex
similarity index 100%
rename from app/lib/firehose/checks/no_conn_shadowing.ex
rename to app/lib_dev/firehose/checks/no_conn_shadowing.ex
diff --git a/app/mix.exs b/app/mix.exs
index bbb6131..f50949a 100644
--- a/app/mix.exs
+++ b/app/mix.exs
@@ -32,7 +32,8 @@ defmodule Firehose.MixProject do
   end
 
   # Specifies which paths to compile per environment.
-  defp elixirc_paths(:test), do: ["lib", "test/support"]
+  defp elixirc_paths(:test), do: ["lib", "lib_dev", "test/support"]
+  defp elixirc_paths(:dev), do: ["lib", "lib_dev"]
   defp elixirc_paths(_), do: ["lib"]
 
   # Specifies your project dependencies.