diff --git a/crates/ra_lsp_server/src/path_map.rs b/crates/ra_lsp_server/src/path_map.rs
index 33babda4b4..02e54629c7 100644
--- a/crates/ra_lsp_server/src/path_map.rs
+++ b/crates/ra_lsp_server/src/path_map.rs
@@ -33,7 +33,7 @@ impl PathMap {
         let file_id = self
             .path2id
             .get(path.as_path())
-            .cloned()
+            .map(|&id| id)
             .unwrap_or_else(|| {
                 inserted = true;
                 let id = self.new_file_id();