diff --git a/src/stages/ast_simplified/types.ml b/src/stages/ast_simplified/types.ml
index a941bf8fb..94b64044f 100644
--- a/src/stages/ast_simplified/types.ml
+++ b/src/stages/ast_simplified/types.ml
@@ -19,8 +19,6 @@ and declaration =
    *   an expression *)
   | Declaration_constant of (expression_variable * type_expression option * inline * expression)
 
-  (* | Macro_declaration of macro_declaration *)
-
 and expr = expression
 
 and lambda = {
diff --git a/src/stages/ast_typed/types.ml b/src/stages/ast_typed/types.ml
index d153a1cff..4e3355ce4 100644
--- a/src/stages/ast_typed/types.ml
+++ b/src/stages/ast_typed/types.ml
@@ -15,8 +15,6 @@ and declaration =
    *   the environment after the declaration (i.e. with that new declaration added to the original environment). *)
   | Declaration_constant of (named_expression * inline * (full_environment * full_environment))
 
-  (* | Macro_declaration of macro_declaration *)
-
 and environment_element_definition =
   | ED_binder
   | ED_declaration of (annotated_expression * free_variables)