diff --git a/bluepyemodel/evaluation/protocols.py b/bluepyemodel/evaluation/protocols.py
index 23984cd7..95eacfad 100644
--- a/bluepyemodel/evaluation/protocols.py
+++ b/bluepyemodel/evaluation/protocols.py
@@ -1002,7 +1002,7 @@ def run(self, cell_model, param_values, sim=None, isolate=None, timeout=None):
                 logger.debug(
                     "Skipping protocol %s, using saved value %s",
                     protocol_name,
-                    self.threshold_data[prot_output_key]
+                    self.threshold_data[prot_output_key],
                 )
                 new_responses = {prot_output_key, self.threshold_data[prot_output_key]}
             else: