diff --git a/swh/scanner/output.py b/swh/scanner/output.py
--- a/swh/scanner/output.py
+++ b/swh/scanner/output.py
@@ -81,7 +81,7 @@
         end = "/" if node.object_type == "directory" else ""
 
         if isatty:
-            if not self.nodes_data[str(node.swhid())]["known"]:
+            if not self.nodes_data[node.swhid()]["known"]:
                 rel_path = colorize(rel_path, Color.RED)
             elif node.object_type == "directory":
                 rel_path = colorize(rel_path, Color.BLUE)