diff --git a/src/Zenith/DB.hs b/src/Zenith/DB.hs
index 2ac4e27..fea47ca 100644
--- a/src/Zenith/DB.hs
+++ b/src/Zenith/DB.hs
@@ -12,6 +12,7 @@
 {-# LANGUAGE UndecidableInstances #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE TypeOperators #-}
 
 module Zenith.DB where