diff --git a/src/qibotn/backends/quimb.py b/src/qibotn/backends/quimb.py
index 020951b..276b4b9 100644
--- a/src/qibotn/backends/quimb.py
+++ b/src/qibotn/backends/quimb.py
@@ -329,7 +329,7 @@ def QuimbBackend(
         "configure_tn_simulation": configure_tn_simulation,
         "setup_backend_specifics": setup_backend_specifics,
         "execute_circuit": execute_circuit,
-        "expectation_observable_symbolic_from_state": expectation_observable_symbolic_from_state,
+        "expectation_observable_symbolic": expectation_observable_symbolic,
         "_qibo_circuit_to_quimb": _qibo_circuit_to_quimb,
         "_string_to_quimb_operator": _string_to_quimb_operator,
         "circuit_ansatz": circuit_ansatz,