diff --git a/lib/ecto_enum/typespec.ex b/lib/ecto_enum/typespec.ex
index cb72d4e..392fbbf 100644
--- a/lib/ecto_enum/typespec.ex
+++ b/lib/ecto_enum/typespec.ex
@@ -13,17 +13,3 @@ defmodule EctoEnum.Typespec do
 
   defp add_type(type, acc), do: {:|, [], [type, acc]}
 end
-
-defmodule EctoEnum.Typespec.TestModule do
-  @moduledoc """
-  Sample enum-containing module for testing type generation. Types aren't
-  generated for dynamically generated modules that eunit uses, so we have to
-  prepare this module in advance
-  """
-
-  import EctoEnum
-
-  defenum StatusEnum, registered: 0, active: 1, inactive: 2, archived: 3
-
-  defenum PGStatusEnum, :status, [:registered, :active, :inactive, :archived]
-end
diff --git a/mix.exs b/mix.exs
index b7d1db7..e2f27ac 100644
--- a/mix.exs
+++ b/mix.exs
@@ -13,13 +13,17 @@ defmodule EctoEnum.Mixfile do
       test_paths: test_paths(Mix.env()),
       package: package(),
       name: "EctoEnum",
-      docs: [source_ref: "v#{@version}", source_url: "https://github.com/gjaldon/ecto_enum"]
+      docs: [source_ref: "v#{@version}", source_url: "https://github.com/gjaldon/ecto_enum"],
+      elixirc_paths: elixrc_paths(Mix.env())
     ]
   end
 
   defp test_paths(:mysql), do: ["test/mysql"]
   defp test_paths(_), do: ["test/pg"]
 
+  defp elixrc_paths(env) when env in ~w(mysql test)a, do: ["lib", "test/support"]
+  defp elixrc_paths(_), do: ["lib"]
+
   defp package do
     [
       maintainers: ["Gabriel Jaldon"],
diff --git a/test/support/typespec_test_module.ex b/test/support/typespec_test_module.ex
new file mode 100644
index 0000000..9695c10
--- /dev/null
+++ b/test/support/typespec_test_module.ex
@@ -0,0 +1,13 @@
+defmodule EctoEnum.Typespec.TestModule do
+  @moduledoc """
+  Sample enum-containing module for testing type generation. Types aren't
+  generated for dynamically generated modules that eunit uses, so we have to
+  prepare this module in advance
+  """
+
+  import EctoEnum
+
+  defenum StatusEnum, registered: 0, active: 1, inactive: 2, archived: 3
+
+  defenum PGStatusEnum, :status, [:registered, :active, :inactive, :archived]
+end