diff --git a/monitor/gen-fan-monitor-defs.py b/monitor/gen-fan-monitor-defs.py
index 310f475..7386508 100755
--- a/monitor/gen-fan-monitor-defs.py
+++ b/monitor/gen-fan-monitor-defs.py
@@ -56,6 +56,7 @@
                   ${fan_data['num_sensors_nonfunc_for_fan_nonfunc']},
                   0, // Monitor start delay - not used in YAML configs
                   std::nullopt, // nonfuncRotorErrorDelay - also not used here
+                  std::nullopt, // fanMissingErrorDelay - also not used here
                   std::vector<SensorDefinition>{
                   %for sensor in fan_data['sensors']:
                   <%