diff --git a/rust/hg-core/src/dirstate_tree/dirstate_map.rs b/rust/hg-core/src/dirstate_tree/dirstate_map.rs
--- a/rust/hg-core/src/dirstate_tree/dirstate_map.rs
+++ b/rust/hg-core/src/dirstate_tree/dirstate_map.rs
@@ -1284,8 +1284,8 @@
 
     pub fn copy_map_insert(
         &mut self,
-        key: HgPathBuf,
-        value: HgPathBuf,
+        key: &HgPath,
+        value: &HgPath,
     ) -> Result<Option<HgPathBuf>, DirstateV2ParseError> {
         self.with_dmap_mut(|map| {
             let node = DirstateMap::get_or_insert_node(
@@ -1299,7 +1299,10 @@
             if node.copy_source.is_none() {
                 map.nodes_with_copy_source_count += 1
             }
-            Ok(node.copy_source.replace(value.into()).map(Cow::into_owned))
+            Ok(node
+                .copy_source
+                .replace(value.to_owned().into())
+                .map(Cow::into_owned))
         })
     }
 
diff --git a/rust/hg-cpython/src/dirstate/dirstate_map.rs b/rust/hg-cpython/src/dirstate/dirstate_map.rs
--- a/rust/hg-cpython/src/dirstate/dirstate_map.rs
+++ b/rust/hg-cpython/src/dirstate/dirstate_map.rs
@@ -23,13 +23,10 @@
     pybytes_deref::PyBytesDeref,
 };
 use hg::{
-    dirstate::StateMapIter,
-    dirstate_tree::on_disk::DirstateV2ParseError,
-    dirstate_tree::owning::OwningDirstateMap,
-    revlog::Node,
-    utils::files::normalize_case,
-    utils::hg_path::{HgPath, HgPathBuf},
-    DirstateEntry, DirstateError, DirstateParents, EntryState,
+    dirstate::StateMapIter, dirstate_tree::on_disk::DirstateV2ParseError,
+    dirstate_tree::owning::OwningDirstateMap, revlog::Node,
+    utils::files::normalize_case, utils::hg_path::HgPath, DirstateEntry,
+    DirstateError, DirstateParents, EntryState,
 };
 
 // TODO
@@ -411,8 +408,8 @@
         self.inner(py)
             .borrow_mut()
             .copy_map_insert(
-                HgPathBuf::from_bytes(key.data(py)),
-                HgPathBuf::from_bytes(value.data(py)),
+                HgPath::new(key.data(py)),
+                HgPath::new(value.data(py)),
             )
             .map_err(|e| v2_error(py, e))?;
         Ok(py.None())