diff --git a/applications/utilities/postProcessing/lagrangian/steadyParticleTracks/steadyParticleTracksTemplates.H b/applications/utilities/postProcessing/lagrangian/steadyParticleTracks/steadyParticleTracksTemplates.H
index a68f1da9b..e0b9ac6ab 100644
--- a/applications/utilities/postProcessing/lagrangian/steadyParticleTracks/steadyParticleTracksTemplates.H
+++ b/applications/utilities/postProcessing/lagrangian/steadyParticleTracks/steadyParticleTracksTemplates.H
@@ -73,7 +73,7 @@ template<class Type>
 void processFields
 (
     OFstream& os,
-    const List<SortableList<scalar>>& agePerTrack,
+    const List<List<label>>& addr,
     const List<word>& userFieldNames,
     const IOobjectList& cloudObjs
 );