diff --git a/semantic-ast/src/CLI.hs b/semantic-ast/src/CLI.hs
index 30fbc68f8..aef19ae6e 100644
--- a/semantic-ast/src/CLI.hs
+++ b/semantic-ast/src/CLI.hs
@@ -11,9 +11,6 @@ import Source.Span
 import Data.ByteString (ByteString)
 
 
-newtype SignalException = SignalException Signal
-  deriving (Show, Typeable)
-instance Exception SignalException
 
 
 main :: IO ()