diff --git a/src/Term.hs b/src/Term.hs
index dd02103a0..2c5ca3375 100644
--- a/src/Term.hs
+++ b/src/Term.hs
@@ -92,3 +92,4 @@ instance GAlign ((,) a) where
 
 instance GAlign []
 instance GAlign (OrderedMap key)
+instance GAlign (Syntax a)