diff --git a/sway-core/src/type_system/substitute/subst_types.rs b/sway-core/src/type_system/substitute/subst_types.rs
index aa7b11a1a12..16f1bbaffee 100644
--- a/sway-core/src/type_system/substitute/subst_types.rs
+++ b/sway-core/src/type_system/substitute/subst_types.rs
@@ -1,7 +1,9 @@
 use crate::{engine_threading::*, type_system::priv_prelude::*};
 
+#[derive(Default)]
 pub enum HasChanges {
     Yes,
+    #[default]
     No,
 }
 
@@ -11,12 +13,6 @@ impl HasChanges {
     }
 }
 
-impl Default for HasChanges {
-    fn default() -> Self {
-        HasChanges::No
-    }
-}
-
 impl std::ops::BitOr for HasChanges {
     type Output = HasChanges;
 
@@ -71,7 +67,7 @@ impl<T: SubstTypes> SubstTypes for Vec<T> {
 #[macro_export]
 macro_rules! has_changes {
     ($($stmts:expr);* ;) => {{
-        let mut has_change = crate::type_system::HasChanges::No;
+        let mut has_change = $crate::type_system::HasChanges::No;
         $(
             has_change = $stmts | has_change;
         )*