diff --git a/servant-server/test/Servant/Server/UsingConfigSpec.hs b/servant-server/test/Servant/Server/UsingConfigSpec.hs
index b3df2805..b2d04f76 100644
--- a/servant-server/test/Servant/Server/UsingConfigSpec.hs
+++ b/servant-server/test/Servant/Server/UsingConfigSpec.hs
@@ -1,11 +1,6 @@
 {-# LANGUAGE DataKinds #-}
-{-# LANGUAGE FlexibleContexts #-}
-{-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE TypeOperators #-}
-{-# LANGUAGE UndecidableInstances #-}
 
 module Servant.Server.UsingConfigSpec where
 
@@ -14,34 +9,7 @@ import           Test.Hspec (Spec, describe, it)
 import           Test.Hspec.Wai
 
 import           Servant
-import           Servant.Server.Internal.Config
-import           Servant.Server.Internal.Router
-import           Servant.Server.Internal.RoutingApplication
-
--- * custom test combinator
-
-data CustomCombinator
-
-data CustomConfig = CustomConfig String
-
-data Tag
-
-instance forall subApi (c :: [*]) .
-  (HasServer subApi) =>
-  HasServer (CustomCombinator :> subApi) where
-
-  type ServerT (CustomCombinator :> subApi) m =
-    CustomConfig -> ServerT subApi m
-  type HasCfg (CustomCombinator :> subApi) c =
-    (HasConfigEntry c Tag CustomConfig, HasCfg subApi c)
-
-  route Proxy config delayed =
-    route subProxy config (fmap (inject config) delayed :: Delayed (Server subApi))
-    where
-      subProxy :: Proxy subApi
-      subProxy = Proxy
-
-      inject config f = f (getConfigEntry (Proxy :: Proxy Tag) config)
+import           Servant.Server.UsingConfigSpec.CustomCombinator
 
 -- * API
 
@@ -59,7 +27,7 @@ app =
   serve api config testServer
   where
     config :: Config '[ConfigEntry Tag CustomConfig]
-    config = CustomConfig "configValue" .: EmptyConfig
+    config = CustomConfig "configValue" .:. EmptyConfig
 
 -- * tests
 
diff --git a/servant-server/test/Servant/Server/UsingConfigSpec/CustomCombinator.hs b/servant-server/test/Servant/Server/UsingConfigSpec/CustomCombinator.hs
new file mode 100644
index 00000000..7af63c42
--- /dev/null
+++ b/servant-server/test/Servant/Server/UsingConfigSpec/CustomCombinator.hs
@@ -0,0 +1,47 @@
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE FlexibleInstances #-}
+{- LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE KindSignatures #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
+{- LANGUAGE UndecidableInstances #-}
+
+-- | This is a custom combinator for S.S.UsingConfigSpec. It's split up into
+-- its own module to be able to test how exactly module import work when using
+-- the config.
+module Servant.Server.UsingConfigSpec.CustomCombinator where
+
+-- import           Network.Wai
+-- import           Test.Hspec (Spec, describe, it)
+-- import           Test.Hspec.Wai
+
+import           Servant
+import           Servant.Server.Internal.Config
+-- import           Servant.Server.Internal.Router
+import           Servant.Server.Internal.RoutingApplication
+
+data CustomCombinator
+
+data CustomConfig = CustomConfig String
+
+data Tag
+
+instance forall subApi (c :: [*]) .
+  (HasServer subApi) =>
+  HasServer (CustomCombinator :> subApi) where
+
+  type ServerT (CustomCombinator :> subApi) m =
+    CustomConfig -> ServerT subApi m
+  type HasCfg (CustomCombinator :> subApi) c =
+    (HasConfigEntry c Tag CustomConfig, HasCfg subApi c)
+
+  route Proxy config delayed =
+    route subProxy config (fmap (inject config) delayed :: Delayed (Server subApi))
+    where
+      subProxy :: Proxy subApi
+      subProxy = Proxy
+
+      inject config f = f (getConfigEntry (Proxy :: Proxy Tag) config)
+