diff --git a/tensorflow/python/training/tracking/graph_view.py b/tensorflow/python/training/tracking/graph_view.py
index 967bb47c6c5..5b71ed418fc 100644
--- a/tensorflow/python/training/tracking/graph_view.py
+++ b/tensorflow/python/training/tracking/graph_view.py
@@ -118,9 +118,10 @@ def _serialize_slot_variables(trackable_objects, node_ids, object_names):
                 "bothers you.")
           if slot_variable in node_ids:
             raise NotImplementedError(
-                "A slot variable was re-used as a dependency of a "
-                "Trackable object. This is not currently allowed. File a "
-                "feature request if this limitation bothers you.")
+                ("A slot variable was re-used as a dependency of a "
+                 "Trackable object: %s. This is not currently "
+                 "allowed. File a feature request if this limitation bothers "
+                 "you.") % slot_variable)
           checkpoint_name = naming_scheme(
               variable_path=object_names[original_variable],
               slot_name=slot_name)