diff --git a/guide.cabal b/guide.cabal
index c2ccdf5..2ada9c2 100644
--- a/guide.cabal
+++ b/guide.cabal
@@ -95,3 +95,13 @@ executable guide
                        -threaded "-with-rtsopts=-T -N"
   hs-source-dirs:      src
   default-language:    Haskell2010
+  default-extensions:  MultiWayIf
+                     , ViewPatterns
+                     , RecordWildCards
+                     , TupleSections
+                     , LambdaCase
+                     , RankNTypes
+                     , MultiParamTypeClasses
+                     , FunctionalDependencies
+                     , TemplateHaskell
+
diff --git a/src/Config.hs b/src/Config.hs
index 6c87231..a0614d0 100644
--- a/src/Config.hs
+++ b/src/Config.hs
@@ -1,6 +1,5 @@
 {-# LANGUAGE
 OverloadedStrings,
-RecordWildCards,
 NoImplicitPrelude
   #-}
 
diff --git a/src/Main.hs b/src/Main.hs
index 77939ff..906594e 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -3,7 +3,6 @@ OverloadedStrings,
 ScopedTypeVariables,
 TypeFamilies,
 DataKinds,
-MultiWayIf,
 FlexibleContexts,
 NoImplicitPrelude
   #-}
diff --git a/src/Markdown.hs b/src/Markdown.hs
index b58b080..841bc9f 100644
--- a/src/Markdown.hs
+++ b/src/Markdown.hs
@@ -1,8 +1,5 @@
 {-# LANGUAGE
 OverloadedStrings,
-TemplateHaskell,
-MultiParamTypeClasses,
-FunctionalDependencies,
 FlexibleInstances,
 FlexibleContexts,
 NoImplicitPrelude
diff --git a/src/Types.hs b/src/Types.hs
index e722a7b..6310419 100644
--- a/src/Types.hs
+++ b/src/Types.hs
@@ -1,14 +1,8 @@
 {-# LANGUAGE
-TemplateHaskell,
-MultiParamTypeClasses,
-FunctionalDependencies,
 FlexibleContexts,
 FlexibleInstances,
-RecordWildCards,
 TypeFamilies,
 OverloadedStrings,
-RankNTypes,
-TupleSections,
 NoImplicitPrelude
   #-}
 
diff --git a/src/Utils.hs b/src/Utils.hs
index 4cbfab8..41cfe22 100644
--- a/src/Utils.hs
+++ b/src/Utils.hs
@@ -1,11 +1,9 @@
 {-# LANGUAGE
 OverloadedStrings,
-TemplateHaskell,
 GeneralizedNewtypeDeriving,
 FlexibleContexts,
 FlexibleInstances,
 TypeFamilies,
-RecordWildCards,
 NoImplicitPrelude
   #-}
 
diff --git a/src/View.hs b/src/View.hs
index 7034e84..db3ed3f 100644
--- a/src/View.hs
+++ b/src/View.hs
@@ -2,9 +2,6 @@
 QuasiQuotes,
 OverloadedStrings,
 FlexibleContexts,
-ViewPatterns,
-RecordWildCards,
-TupleSections,
 NoImplicitPrelude
   #-}