diff --git a/src/PgStructure.hs b/src/PgStructure.hs
index 560f9c576..d9d226063 100644
--- a/src/PgStructure.hs
+++ b/src/PgStructure.hs
@@ -1,5 +1,6 @@
 {-# LANGUAGE QuasiQuotes, OverloadedStrings, TypeSynonymInstances,
-             MultiParamTypeClasses, ScopedTypeVariables #-}
+             MultiParamTypeClasses, ScopedTypeVariables,
+             FlexibleContexts #-}
 module PgStructure where
 
 import PgQuery (QualifiedTable(..))