diff --git a/protocol/llrp/manager.cpp b/protocol/llrp/manager.cpp
index 8baa833..80fc59f 100644
--- a/protocol/llrp/manager.cpp
+++ b/protocol/llrp/manager.cpp
@@ -34,6 +34,7 @@ namespace RDMnet::LLRP {
 Manager::Manager(UUID::uuid cid)
   : ACN::RLP::Component(cid)
   , transactionNumber(0)
+  , probeInactiveOnly(true)
 {
   fctn_ = "OpenLCP LLRP Manager";
 
diff --git a/protocol/llrp/manager.h b/protocol/llrp/manager.h
index cdc5555..677a687 100644
--- a/protocol/llrp/manager.h
+++ b/protocol/llrp/manager.h
@@ -47,6 +47,12 @@ public:
 
 private:
   uint32_t transactionNumber;
+
+  /// > \cite RDMnet 5.4.2.1 Probe Request PDU
+  /// > LLRP Managers shall set this bit by default and shall only clear
+  /// > it as a result of a user-configured setting in a user-generated
+  /// > Probe Request.
+  bool probeInactiveOnly;
 };
 
 } // namespace RDMnet::LLRP