diff --git a/src/lagrangian/cfdemParticle/subModels/dataExchangeModel/twoWayOne2One/twoWayOne2One.C b/src/lagrangian/cfdemParticle/subModels/dataExchangeModel/twoWayOne2One/twoWayOne2One.C
index 715cbdc9..b8c314f6 100644
--- a/src/lagrangian/cfdemParticle/subModels/dataExchangeModel/twoWayOne2One/twoWayOne2One.C
+++ b/src/lagrangian/cfdemParticle/subModels/dataExchangeModel/twoWayOne2One/twoWayOne2One.C
@@ -966,6 +966,10 @@ void twoWayOne2One::extractCollected(T*& src, T**& dst, int width) const
     }
 }
 
+int twoWayOne2One::getNumberOfParticles() const
+{
+    return particleCloud_.numberOfParticles();
+}
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
diff --git a/src/lagrangian/cfdemParticle/subModels/dataExchangeModel/twoWayOne2One/twoWayOne2One.H b/src/lagrangian/cfdemParticle/subModels/dataExchangeModel/twoWayOne2One/twoWayOne2One.H
index 9f436b50..a6ee34da 100644
--- a/src/lagrangian/cfdemParticle/subModels/dataExchangeModel/twoWayOne2One/twoWayOne2One.H
+++ b/src/lagrangian/cfdemParticle/subModels/dataExchangeModel/twoWayOne2One/twoWayOne2One.H
@@ -208,6 +208,8 @@ public:
         template <typename T>
         void extractCollected(T*&, T**&, int width=1) const;
 
+        int getNumberOfParticles() const;
+
         scalar getCG() const { return lmp->force->cg(); }
 };