diff --git a/libraries/particles/src/ParticleTree.cpp b/libraries/particles/src/ParticleTree.cpp
index a3c8072b3a..31f5216462 100644
--- a/libraries/particles/src/ParticleTree.cpp
+++ b/libraries/particles/src/ParticleTree.cpp
@@ -390,17 +390,20 @@ bool ParticleTree::encodeParticlesDeletedSince(uint64_t& sinceTime, unsigned cha
 
 // called by the server when it knows all nodes have been sent deleted packets
 void ParticleTree::forgetParticlesDeletedBefore(uint64_t sinceTime) {
+    //qDebug() << "forgetParticlesDeletedBefore()";
     _recentlyDeletedParticlesLock.lockForWrite();
-    QMultiMap<uint64_t, uint32_t>::const_iterator iterator = _recentlyDeletedParticleIDs.constBegin();
-    while (iterator != _recentlyDeletedParticleIDs.constEnd()) {
+    QMultiMap<uint64_t, uint32_t>::iterator iterator = _recentlyDeletedParticleIDs.begin();
+    while (iterator != _recentlyDeletedParticleIDs.end()) {
         //qDebug() << "considering... time/key:" << iterator.key();
         if (iterator.key() <= sinceTime) {
             //qDebug() << "YES older... time/key:" << iterator.key();
             _recentlyDeletedParticleIDs.remove(iterator.key());
         }
+        //qDebug() << "about to ++iterator";
         ++iterator;
     }
     _recentlyDeletedParticlesLock.unlock();
+    //qDebug() << "DONE forgetParticlesDeletedBefore()";
 }