diff --git a/compiler/unify/src/unify.rs b/compiler/unify/src/unify.rs
index 6eee91b429..3f88aff3bd 100644
--- a/compiler/unify/src/unify.rs
+++ b/compiler/unify/src/unify.rs
@@ -1058,7 +1058,7 @@ fn unify_flat_type(
             tags2.insert(tag_name.clone(), vec![]);
 
             let union1 = gather_tags(subs, tags1.clone(), *ext1);
-            let union2 = gather_tags(subs, tags2.clone(), *ext2);
+            let union2 = gather_tags(subs, tags2, *ext2);
 
             unify_tag_union(
                 subs,
@@ -1076,7 +1076,7 @@ fn unify_flat_type(
             let mut tags1 = MutMap::default();
             tags1.insert(tag_name.clone(), vec![]);
 
-            let union1 = gather_tags(subs, tags1.clone(), *ext1);
+            let union1 = gather_tags(subs, tags1, *ext1);
             let union2 = gather_tags(subs, tags2.clone(), *ext2);
 
             unify_tag_union_not_recursive_recursive(subs, pool, ctx, union1, union2, *recursion_var)