diff --git a/src/qibotn/cutn.py b/src/qibotn/cutn.py
index 36f7866..6deb078 100644
--- a/src/qibotn/cutn.py
+++ b/src/qibotn/cutn.py
@@ -5,6 +5,6 @@ from cuquantum import contract
 
 def eval(qibo_circ, datatype):
     myconvertor = QiboCircuitToEinsum(qibo_circ, dtype=datatype)
-    operands_expression = myconvertor.state_vector()
+    operands_expression = myconvertor.state_vector_operands()
     results = contract(*operands_expression)
     return results