diff --git a/n3fit/src/n3fit/backends/keras_backend/MetaModel.py b/n3fit/src/n3fit/backends/keras_backend/MetaModel.py
index e19eab67da..fb17766db4 100644
--- a/n3fit/src/n3fit/backends/keras_backend/MetaModel.py
+++ b/n3fit/src/n3fit/backends/keras_backend/MetaModel.py
@@ -391,7 +391,6 @@ def split_replicas(self):
             list
                 list of single replica models
         """
-        num_replicas = self.output.shape[-1]
         replicas = []
         for i_replica, replica in enumerate(self.single_replicas.replicas):
             replica.set_replica_weights(self.get_replica_weights(i_replica))