diff --git a/hsql.cabal b/hsql.cabal
index 6595eee..7e198e9 100644
--- a/hsql.cabal
+++ b/hsql.cabal
@@ -19,7 +19,7 @@ exposed-modules:
 	Database.HSQL.Types
 build-depends:	base==4.*, old-time
 extensions: CPP, ForeignFunctionInterface, DeriveDataTypeable, RankNTypes,
-			ScopedTypeVariables
+			ScopedTypeVariables, FlexibleInstances
 build-type: Simple
 license-file: LICENSE
 cabal-version: >= 1.6