diff --git a/protocol/llrp/manager.cpp b/protocol/llrp/manager.cpp
index 65d221b..8baa833 100644
--- a/protocol/llrp/manager.cpp
+++ b/protocol/llrp/manager.cpp
@@ -33,6 +33,7 @@ namespace RDMnet::LLRP {
  */
 Manager::Manager(UUID::uuid cid)
   : ACN::RLP::Component(cid)
+  , transactionNumber(0)
 {
   fctn_ = "OpenLCP LLRP Manager";
 
diff --git a/protocol/llrp/manager.h b/protocol/llrp/manager.h
index 4d860dd..cdc5555 100644
--- a/protocol/llrp/manager.h
+++ b/protocol/llrp/manager.h
@@ -44,6 +44,9 @@ public:
 
   virtual void sendProbeRequest();
   virtual void receiveProbeReply(ACN::PDU::Message<LLRP::ProbeReply::Pdu>);
+
+private:
+  uint32_t transactionNumber;
 };
 
 } // namespace RDMnet::LLRP