diff --git a/libcnmc/cir_8_2021/FB1.py b/libcnmc/cir_8_2021/FB1.py
index 707fedfc..727575f2 100644
--- a/libcnmc/cir_8_2021/FB1.py
+++ b/libcnmc/cir_8_2021/FB1.py
@@ -867,7 +867,7 @@ def get_inst_name(element_id):
                                 'cini', 'codigo_ccuu', 'longitud',
                                 'tension_explotacion', 'fecha_aps'
                             ])
-                            entregada = F1Res4666(
+                            entregada = F2Res4666(
                                 cini=hist['cini'],
                                 longitud=hist['longitud'],
                                 codigo_ccuu=hist['codigo_ccuu'],