diff --git a/Trigger/TrigCost/TrigCostAnalysis/src/CostData.cxx b/Trigger/TrigCost/TrigCostAnalysis/src/CostData.cxx
index 520bb1afa061fd1e7db0fa993c09a1840b6c7e7a..6bae94a556ec4aa5eedc1541b85f3a3ead218bb2 100644
--- a/Trigger/TrigCost/TrigCostAnalysis/src/CostData.cxx
+++ b/Trigger/TrigCost/TrigCostAnalysis/src/CostData.cxx
@@ -73,7 +73,7 @@ uint32_t CostData::onlineSlot() const {
   return m_slot;
 }
 
-bool CostData::isMaterSlot() const {
+bool CostData::isMasterSlot() const {
   return (onlineSlot() == 0);
 }
 
diff --git a/Trigger/TrigCost/TrigCostAnalysis/src/CostData.h b/Trigger/TrigCost/TrigCostAnalysis/src/CostData.h
index 0b86a3baadf11a953deb639208921f017a8439d5..7feb0ec2bae90a717c2e0c3353029c44c8306831 100644
--- a/Trigger/TrigCost/TrigCostAnalysis/src/CostData.h
+++ b/Trigger/TrigCost/TrigCostAnalysis/src/CostData.h
@@ -89,7 +89,7 @@ class CostData {
     /**
      * @return True if event was processed in the master slot (0), and hence contains cost data spanning all concurrent slots
      */
-    bool isMaterSlot() const;
+    bool isMasterSlot() const;
 
     /**
      * @brief Getter of the total algorithm CPU time in the event. 
diff --git a/Trigger/TrigCost/TrigCostAnalysis/src/TrigCostAnalysis.cxx b/Trigger/TrigCost/TrigCostAnalysis/src/TrigCostAnalysis.cxx
index f90937a039f1042de1b168ac474c15dbac321ebe..8efcae34b57bec6259c8124095e0a0255cd712dd 100644
--- a/Trigger/TrigCost/TrigCostAnalysis/src/TrigCostAnalysis.cxx
+++ b/Trigger/TrigCost/TrigCostAnalysis/src/TrigCostAnalysis.cxx
@@ -155,7 +155,7 @@ StatusCode TrigCostAnalysis::execute() {
 
   ATH_CHECK( range->newEvent( costData, getWeight(context) ) );
 
-  if (checkDoFullEventDump(context, onlineSlot)) {
+  if (checkDoFullEventDump(context, costData)) {
     ATH_CHECK( dumpEvent(context) );
   }
 
@@ -163,8 +163,8 @@ StatusCode TrigCostAnalysis::execute() {
 }
 
 
-bool TrigCostAnalysis::checkDoFullEventDump(const EventContext& context, const uint32_t onlineSlot) {
-  if (onlineSlot == 0
+bool TrigCostAnalysis::checkDoFullEventDump(const EventContext& context, const CostData& costData) {
+  if (costData.isMasterSlot()
     and m_fullEventDumps < m_maxFullEventDumps 
     and context.eventID().event_number() % m_fullEventDumpProbability == 0)
   {
diff --git a/Trigger/TrigCost/TrigCostAnalysis/src/TrigCostAnalysis.h b/Trigger/TrigCost/TrigCostAnalysis/src/TrigCostAnalysis.h
index 5d2c7e5d64cff00de966612e6c00056dbcc71217..874e76e0abfa9814dc9adc71503590cfd7fe10e0 100644
--- a/Trigger/TrigCost/TrigCostAnalysis/src/TrigCostAnalysis.h
+++ b/Trigger/TrigCost/TrigCostAnalysis/src/TrigCostAnalysis.h
@@ -116,11 +116,10 @@ class TrigCostAnalysis: public ::AthHistogramAlgorithm {
     /**
      * @brief Check if event dumping should be performed for the current event.
      * @param[in] context Event context.
-     * @param[in] onelineSlot The slot used to process the event in the trigger.
-     *                        We only dump slot 0 as these events cary payload data for all events.
+     * @param[in] costData We only dump the master-slot (slot:0) as these events cary payload data for all slots / all threads.
      * @return True, if the event should be dumped.
      */
-    bool checkDoFullEventDump(const EventContext& context, const uint32_t onlineSlot);
+    bool checkDoFullEventDump(const EventContext& context, const CostData& costData);
 
     /**
      * @brief Return or construct and return a Range for the Context. Might return nullptr range.