diff --git a/servant.cabal b/servant.cabal
index 67a39395..7dc591e5 100644
--- a/servant.cabal
+++ b/servant.cabal
@@ -55,19 +55,25 @@ library
     , network-uri >= 2.6
   hs-source-dirs: src
   default-language: Haskell2010
-  other-extensions: DataKinds
+  other-extensions: ConstraintKinds
+                  , DataKinds
                   , DeriveDataTypeable
+                  , FlexibleInstances
                   , FunctionalDependencies
+                  , GADTs
                   , KindSignatures
                   , MultiParamTypeClasses
+                  , OverlappingInstances
+                  , OverloadedStrings
                   , PolyKinds
                   , QuasiQuotes
+                  , RecordWildCards
                   , ScopedTypeVariables
                   , TemplateHaskell
                   , TypeFamilies
                   , TypeOperators
+                  , TypeSynonymInstances
                   , UndecidableInstances
-                  , FlexibleInstances
   ghc-options: -Wall
 
 test-suite spec