diff --git a/src/spikeinterface/widgets/unit_templates.py b/src/spikeinterface/widgets/unit_templates.py
index 258ca2adaa..1d0191092f 100644
--- a/src/spikeinterface/widgets/unit_templates.py
+++ b/src/spikeinterface/widgets/unit_templates.py
@@ -27,7 +27,7 @@ def plot_sortingview(self, data_plot, **backend_kwargs):
         unit_id_to_channel_ids = dp.final_sparsity.unit_id_to_channel_ids
         unit_id_to_channel_indices = dp.final_sparsity.unit_id_to_channel_indices
 
-        unit_ids, channel_ids = make_serializable(dp.unit_ids, dp.channel_ids)
+        unit_ids, channel_ids = make_serializable(dp.unit_ids, sorting_analyzer.channel_ids)
 
         templates_dict = {}
         for u_i, unit in enumerate(unit_ids):