diff --git a/src/Data/Syntax/Declaration.hs b/src/Data/Syntax/Declaration.hs
index f3d2876d5..84e9c2d7e 100644
--- a/src/Data/Syntax/Declaration.hs
+++ b/src/Data/Syntax/Declaration.hs
@@ -96,12 +96,6 @@ instance Eq1 Module where liftEq = genericLiftEq
 instance Ord1 Module where liftCompare = genericLiftCompare
 instance Show1 Module where liftShowsPrec = genericLiftShowsPrec
 
-data Interface a = Interface { interfaceIdentifier :: !a, interfaceBody :: ![a] }
-  deriving (Diffable, Eq, Foldable, Functor, GAlign, Generic1, Show, Traversable)
-
-instance Eq1 Interface where liftEq = genericLiftEq
-instance Show1 Interface where liftShowsPrec = genericLiftShowsPrec
-
 -- | A decorator in Python
 data Decorator a = Decorator { decoratorIdentifier :: !a, decoratorParamaters :: ![a], decoratorBody :: !a }
   deriving (Diffable, Eq, Foldable, Functor, GAlign, Generic1, Mergeable, Ord, Show, Traversable)
diff --git a/src/Language/Go/Syntax.hs b/src/Language/Go/Syntax.hs
index 3de2526e1..4aa017380 100644
--- a/src/Language/Go/Syntax.hs
+++ b/src/Language/Go/Syntax.hs
@@ -29,7 +29,6 @@ type Syntax =
    , Declaration.Constructor
    , Declaration.Function
    , Declaration.Import
-   , Declaration.Interface
    , Declaration.Method
    , Declaration.Module
    , Expression.Arithmetic