diff --git a/src/Nix/Effects.hs b/src/Nix/Effects.hs
index 9c0ad88..1c95836 100644
--- a/src/Nix/Effects.hs
+++ b/src/Nix/Effects.hs
@@ -145,7 +145,7 @@ instance MonadInstantiate IO where
           ++ err
 
 pathExists :: MonadFile m => FilePath -> m Bool
-pathExists = doesFileExist
+pathExists = doesPathExist
 
 class Monad m => MonadEnv m where
     getEnvVar :: String -> m (Maybe String)