diff --git a/lib/src/op_heads_store.rs b/lib/src/op_heads_store.rs
index 0eddc71fb..78dfcf5b7 100644
--- a/lib/src/op_heads_store.rs
+++ b/lib/src/op_heads_store.rs
@@ -184,6 +184,7 @@ impl OpHeadsStore {
             return Ok(OpHeads::Single(op_heads.pop().unwrap()));
         }
 
+        op_heads.sort_by_key(|op| op.store_operation().metadata.end_time.timestamp.clone());
         Ok(OpHeads::Unresolved {
             locked_op_heads,
             op_heads,
diff --git a/lib/src/repo.rs b/lib/src/repo.rs
index d3cf7736f..6fc272263 100644
--- a/lib/src/repo.rs
+++ b/lib/src/repo.rs
@@ -387,9 +387,8 @@ impl RepoLoader {
     fn merge_op_heads(
         &self,
         user_settings: &UserSettings,
-        mut op_heads: Vec<Operation>,
+        op_heads: Vec<Operation>,
     ) -> UnpublishedOperation {
-        op_heads.sort_by_key(|op| op.store_operation().metadata.end_time.timestamp.clone());
         let base_repo = self.load_at(&op_heads[0]);
         let mut tx = base_repo.start_transaction("resolve concurrent operations");
         for other_op_head in op_heads.into_iter().skip(1) {