diff --git a/libraries/networking/src/SentPacketHistory.cpp b/libraries/networking/src/SentPacketHistory.cpp
index d0fcecd171..14b4677fc3 100644
--- a/libraries/networking/src/SentPacketHistory.cpp
+++ b/libraries/networking/src/SentPacketHistory.cpp
@@ -39,7 +39,7 @@ void SentPacketHistory::packetSent(uint16_t sequenceNumber, const NLPacket& pack
     _sentPackets.insert(NLPacket::createCopy(packet));
 }
 
-const NLPacket* SentPacketHistory::getPacket(uint16_t sequenceNumber) {
+const NLPacket* SentPacketHistory::getPacket(uint16_t sequenceNumber) const {
 
     const int UINT16_RANGE = std::numeric_limits<uint16_t>::max() + 1;
 
diff --git a/libraries/networking/src/SentPacketHistory.h b/libraries/networking/src/SentPacketHistory.h
index 78b6914c2d..72150658e3 100644
--- a/libraries/networking/src/SentPacketHistory.h
+++ b/libraries/networking/src/SentPacketHistory.h
@@ -28,10 +28,10 @@ public:
     SentPacketHistory(int size = MAX_REASONABLE_SEQUENCE_GAP);
 
     void packetSent(uint16_t sequenceNumber, const NLPacket& packet);
-    const NLPacket* getPacket(uint16_t sequenceNumber);
+    const NLPacket* getPacket(uint16_t sequenceNumber) const;
 
 private:
-    QReadWriteLock _packetsLock { QReadWriteLock::Recursive };
+    mutable QReadWriteLock _packetsLock { QReadWriteLock::Recursive };
     RingBufferHistory<std::unique_ptr<NLPacket>> _sentPackets;    // circular buffer
 
     uint16_t _newestSequenceNumber;
diff --git a/libraries/octree/src/OctreeEditPacketSender.cpp b/libraries/octree/src/OctreeEditPacketSender.cpp
index d4bd939196..495effc825 100644
--- a/libraries/octree/src/OctreeEditPacketSender.cpp
+++ b/libraries/octree/src/OctreeEditPacketSender.cpp
@@ -346,7 +346,8 @@ void OctreeEditPacketSender::processNackPacket(NLPacket& packet, SharedNodePoint
     if (_sentPacketHistories.count(sendingNode->getUUID()) == 0) {
         return;
     }
-    SentPacketHistory& sentPacketHistory = _sentPacketHistories[sendingNode->getUUID()];
+    
+    const SentPacketHistory& sentPacketHistory = _sentPacketHistories[sendingNode->getUUID()];
 
     // read sequence numbers and queue packets for resend
     while (packet.bytesLeftToRead() > 0) {