diff --git a/src/lte/model/pf-ff-mac-scheduler.cc b/src/lte/model/pf-ff-mac-scheduler.cc
index 3758f75fd..618e66356 100644
--- a/src/lte/model/pf-ff-mac-scheduler.cc
+++ b/src/lte/model/pf-ff-mac-scheduler.cc
@@ -40,6 +40,20 @@ int PfType0AllocationRbg[4] = {
 NS_OBJECT_ENSURE_REGISTERED (PfFfMacScheduler);
 
 
+bool
+operator< (const pfsFlowId_t& lhs, const pfsFlowId_t& rhs)
+{
+  if (lhs.m_rnti == rhs.m_rnti)
+    {
+      return (lhs.m_lcId < rhs.m_lcId);
+    }
+  else
+    {
+      return (lhs.m_rnti < rhs.m_rnti);
+    }
+}
+
+
 class PfSchedulerMemberCschedSapProvider : public FfMacCschedSapProvider
 {
 public:
diff --git a/src/lte/model/pf-ff-mac-scheduler.h b/src/lte/model/pf-ff-mac-scheduler.h
index 694edde5e..f86399f4e 100644
--- a/src/lte/model/pf-ff-mac-scheduler.h
+++ b/src/lte/model/pf-ff-mac-scheduler.h
@@ -36,11 +36,10 @@ struct pfsFlowId_t
 {
   uint16_t  m_rnti;
   uint8_t   m_lcId;
-  
-  bool operator<(const pfsFlowId_t& A) const
-  { return m_rnti<A.m_rnti; }
 };
 
+bool operator< (const pfsFlowId_t& lhs, const pfsFlowId_t& rhs);
+
 struct pfsFlowPerf_t
 {
   Time flowStart;