diff --git a/mcp_codebase.py b/mcp_codebase.py
index 053891c..476c813 100644
--- a/mcp_codebase.py
+++ b/mcp_codebase.py
@@ -2105,6 +2105,7 @@ def build_indexes():
         # Keep the same ID (`file::<path>`) but store the full set of
         # attributes so that downstream code can rely on `name`, `lang`,
         # and `file` (even though `name` will just be the file path).
+        file_node_id = f"file::{fpath}"
         if file_node_id not in graph.graph.nodes:
             graph.add_node(
                 file_node_id,