diff --git a/package.yaml b/package.yaml
index eeffdb0b..ef815764 100644
--- a/package.yaml
+++ b/package.yaml
@@ -100,5 +100,7 @@ tests:
       - hspec-expectations-lifted
       - lens-aeson
       - load-env
+      - opt-env-conf
       - restyler
       - text
+      - unliftio
diff --git a/restyler.cabal b/restyler.cabal
index 3a3c3a28..fc889d34 100644
--- a/restyler.cabal
+++ b/restyler.cabal
@@ -146,6 +146,7 @@ test-suite test
       Restyler.Config.CommitTemplateSpec
       Restyler.Config.IncludeSpec
       Restyler.Config.InterpreterSpec
+      Restyler.ConfigSpec
       Restyler.DelimitedSpec
       Restyler.IgnoreSpec
       Restyler.RestrictionsSpec
@@ -187,6 +188,8 @@ test-suite test
     , hspec-expectations-lifted
     , lens-aeson
     , load-env
+    , opt-env-conf
     , restyler
     , text
+    , unliftio
   default-language: GHC2021
diff --git a/src/Restyler/Config.hs b/src/Restyler/Config.hs
index d41545b8..a9fa89f9 100644
--- a/src/Restyler/Config.hs
+++ b/src/Restyler/Config.hs
@@ -10,6 +10,7 @@
 -- Portability : POSIX
 module Restyler.Config
   ( Config (..)
+  , configParser
   , parseConfig
 
     -- * Individual configuration points
@@ -74,16 +75,23 @@ instance HasRestylerOverrides Config where
 
 parseConfig :: IO Config
 parseConfig = do
-  withSystemTempFile "restyler-default-config.yaml" $ \tmp h -> do
+  withSystemTempFile "restyler-default-config.yaml" $ \defaults h -> do
     BS.hPutStr h defaultConfigContent >> hClose h
-    runParser Pkg.version "Restyle local file" $ configParser tmp
+    runParser Pkg.version "Restyle local file"
+      $ configParser
+        [ ".github/restyled.yml"
+        , ".github/restyled.yaml"
+        , ".restyled.yml"
+        , ".restyled.yaml"
+        , defaults
+        ]
 
 defaultConfigContent :: ByteString
 defaultConfigContent = $(embedFile "config/default.yaml")
 
-configParser :: FilePath -> Parser Config
-configParser defaults =
-  withCombinedYamlConfigs (configSources defaults)
+configParser :: [FilePath] -> Parser Config
+configParser paths =
+  withCombinedYamlConfigs (traverse hiddenPath paths)
     $ Config
     <$> setting
       [ help "Do anything at all"
@@ -105,16 +113,6 @@ configParser defaults =
     <*> restylerOverridesParser
     <*> subConfig_ "cli" optionsParser
 
-configSources :: FilePath -> Parser [Path Abs File]
-configSources defaults =
-  sequenceA
-    [ hiddenPath ".github/restyled.yml"
-    , hiddenPath ".github/restyled.yaml"
-    , hiddenPath ".restyled.yml"
-    , hiddenPath ".restyled.yaml"
-    , hiddenPath defaults
-    ]
-
 hiddenPath :: FilePath -> Parser (Path Abs File)
 hiddenPath x = filePathSetting [value x, hidden]
 
diff --git a/test/Restyler/ConfigSpec.hs b/test/Restyler/ConfigSpec.hs
new file mode 100644
index 00000000..17f12c92
--- /dev/null
+++ b/test/Restyler/ConfigSpec.hs
@@ -0,0 +1,52 @@
+module Restyler.ConfigSpec
+  ( spec
+  ) where
+
+import Restyler.Prelude
+
+import Data.Text.IO (hPutStr)
+import OptEnvConf.Args (parseArgs)
+import OptEnvConf.EnvMap qualified as EnvMap
+import OptEnvConf.Run (runParserOn)
+import Restyler.Config
+import System.IO (hClose)
+import Test.Hspec
+import UnliftIO.Temporary (withSystemTempFile)
+
+spec :: Spec
+spec = do
+  it "uses defined defaults" $ do
+    config <- loadTestConfig [] [] ["Foo.hs"]
+    config.enabled `shouldBe` True
+
+loadTestConfig
+  :: HasCallStack
+  => [Text]
+  -- ^ Lines of Yaml
+  --
+  -- Empty means to behave as if no file at all.
+  -> [(String, String)]
+  -- ^ ENV
+  -> [String]
+  -- ^ Args
+  -> IO Config
+loadTestConfig yaml env args = do
+  result <- case yaml of
+    [] -> runParser ["config/default.yaml"]
+    ls -> withSystemTempFile "restyler-test-config.yaml" $ \path h -> do
+      hPutStr h (unlines ls) >> hClose h
+      runParser [path, "config/default.yaml"]
+
+  case result of
+    Left errs -> do
+      expectationFailure $ show errs
+      error "unreachable"
+    Right config -> pure config
+ where
+  runParser paths =
+    runParserOn
+      Nothing
+      (configParser paths)
+      (parseArgs args)
+      (EnvMap.parse env)
+      Nothing