diff --git a/thorlcr/activities/keyedjoin/thkeyedjoinslave.cpp b/thorlcr/activities/keyedjoin/thkeyedjoinslave.cpp
index 59997c87a34..617c1be3271 100644
--- a/thorlcr/activities/keyedjoin/thkeyedjoinslave.cpp
+++ b/thorlcr/activities/keyedjoin/thkeyedjoinslave.cpp
@@ -1765,17 +1765,10 @@ class CKeyedJoinSlave : public CSlaveActivity, implements IJoinProcessor, implem
                     }
                     joinGroup->decPending(); // Every queued lookup row triggered an inc., this is the corresponding dec.
                 }
-                unsigned __int64 seeks, scans, wildseeks;
-                unsigned __int64 nodeDiskFetches, leafDiskFetches, blobDiskFetches;
-                mb.read(seeks).read(scans).read(wildseeks);
-                mb.read(nodeDiskFetches).read(leafDiskFetches).read(blobDiskFetches);
+                CRuntimeStatisticCollection statsDelta(jhtreeCacheStatistics);
+                statsDelta.deserialize(mb);
                 CStatsContextLogger * contextLogger(contextLoggers[selected]);
-                contextLogger->noteStatistic(StNumIndexSeeks, seeks);
-                contextLogger->noteStatistic(StNumIndexScans, scans);
-                contextLogger->noteStatistic(StNumIndexWildSeeks, wildseeks);
-                contextLogger->noteStatistic(StNumNodeDiskFetches, nodeDiskFetches);
-                contextLogger->noteStatistic(StNumLeafDiskFetches, leafDiskFetches);
-                contextLogger->noteStatistic(StNumBlobDiskFetches, blobDiskFetches);
+                contextLogger->mergeStats(statsDelta);
                 if (received == numRows)
                     break;
             }
diff --git a/thorlcr/slave/slavmain.cpp b/thorlcr/slave/slavmain.cpp
index 80f730d83cf..83cf9b82cc7 100644
--- a/thorlcr/slave/slavmain.cpp
+++ b/thorlcr/slave/slavmain.cpp
@@ -771,14 +771,9 @@ class CKJService : public CSimpleInterfaceOf<IKJService>, implements IThreaded,
                     {
                         countMarker.write(rowNum-rowStart);
 
-                        CRuntimeStatisticCollection deltaStats(startStats.queryMapping());
-                        contextLogger.updateStatsDeltaTo(deltaStats, startStats);
-                        replyMb.append(deltaStats.getStatisticValue(StNumIndexSeeks));
-                        replyMb.append(deltaStats.getStatisticValue(StNumIndexScans));
-                        replyMb.append(deltaStats.getStatisticValue(StNumIndexWildSeeks));
-                        replyMb.append(deltaStats.getStatisticValue(StNumNodeDiskFetches));
-                        replyMb.append(deltaStats.getStatisticValue(StNumLeafDiskFetches));
-                        replyMb.append(deltaStats.getStatisticValue(StNumBlobDiskFetches));
+                        CRuntimeStatisticCollection statsDelta(startStats.queryMapping());
+                        contextLogger.updateStatsDeltaTo(statsDelta, startStats);
+                        statsDelta.serialize(replyMb);
                         if (activityCtx->useMessageCompression())
                         {
                             fastLZCompressToBuffer(replyMsg, tmpMB.length(), tmpMB.toByteArray());