diff --git a/oscar/SleepLib/loader_plugins/prs1_loader.cpp b/oscar/SleepLib/loader_plugins/prs1_loader.cpp
index ffb480c7..878e6d5d 100644
--- a/oscar/SleepLib/loader_plugins/prs1_loader.cpp
+++ b/oscar/SleepLib/loader_plugins/prs1_loader.cpp
@@ -7772,6 +7772,7 @@ QList<PRS1DataChunk *> PRS1Import::CoalesceWaveformChunks(QList<PRS1DataChunk *>
             qWarning().noquote() << relativePath(chunk->m_path) << "skipping session" << chunk->sessionid << ":"
                 << QDateTime::fromMSecsSinceEpoch(chunk->timestamp*1000).toString() << "older than"
                 << QDateTime::fromMSecsSinceEpoch(ignoreBefore*1000).toString();
+            delete chunk;
             continue;
         }
         coalescedAndFiltered.append(chunk);
diff --git a/oscar/SleepLib/loader_plugins/prs1_loader.h b/oscar/SleepLib/loader_plugins/prs1_loader.h
index 6731165c..6b634af7 100644
--- a/oscar/SleepLib/loader_plugins/prs1_loader.h
+++ b/oscar/SleepLib/loader_plugins/prs1_loader.h
@@ -281,6 +281,7 @@ public:
         delete summary;
         for (auto & e : m_event_chunks.values()) { delete e; }
         for (int i=0;i < waveforms.size(); ++i) { delete waveforms.at(i); }
+        for (auto & c : oximetry) { delete c; }
     }
 
     //! \brief PRS1Import thread starts execution here.