diff --git a/Syntax.hs b/Syntax.hs
index abc570967..39def0e1c 100644
--- a/Syntax.hs
+++ b/Syntax.hs
@@ -5,8 +5,8 @@ module Syntax where
 import Data.Map
 
 data Syntax f a =
-	Leaf a
-	| Indexed [f]
-	| Fixed [f]
-	| Keyed (Map String f)
-	deriving (Functor, Show, Eq)
+    Leaf a
+    | Indexed [f]
+    | Fixed [f]
+    | Keyed (Map String f)
+    deriving (Functor, Show, Eq)