diff --git a/crates/pacdef_core/src/backend/backend_trait.rs b/crates/pacdef_core/src/backend/backend_trait.rs
index 2e20975..1ff7711 100644
--- a/crates/pacdef_core/src/backend/backend_trait.rs
+++ b/crates/pacdef_core/src/backend/backend_trait.rs
@@ -164,7 +164,7 @@ where
     }
 
     for vecs in map.values_mut() {
-        vecs.sort();
+        vecs.sort_unstable();
     }
     map
 }