diff --git a/lib/pavilion/schedulers/advanced.py b/lib/pavilion/schedulers/advanced.py
index 35f673b47..7d218f29a 100644
--- a/lib/pavilion/schedulers/advanced.py
+++ b/lib/pavilion/schedulers/advanced.py
@@ -113,7 +113,7 @@ def _get_initial_vars(self, sched_config: dict) -> SchedulerVariables:
                 "Requested {} 'schedule.include_nodes' to include in every chunk, but "
                 "set a 'chunking.size' of {}. "
                 "The chunk size must be more than the number of include_nodes."
-                .format(len(include_nodes, chunk_size)))
+                .format(len(include_nodes), chunk_size))
 
         # Min nodes is always >= 1, but max_nodes may be None
         min_nodes, max_nodes = calc_node_range(sched_config, len(filtered_nodes))