diff --git a/oscar/Graphs/gGraphView.h b/oscar/Graphs/gGraphView.h
index 57b0e896..99fcc19e 100644
--- a/oscar/Graphs/gGraphView.h
+++ b/oscar/Graphs/gGraphView.h
@@ -277,6 +277,8 @@ struct SelectionHistoryItem {
     }
     quint64 minx;
     quint64 maxx;
+
+    SelectionHistoryItem& operator=(const SelectionHistoryItem& other) = default;
 };
 
 class MyDockWindow:public QMainWindow
diff --git a/oscar/Graphs/gLineChart.h b/oscar/Graphs/gLineChart.h
index 1da1d8ac..859e6aa0 100644
--- a/oscar/Graphs/gLineChart.h
+++ b/oscar/Graphs/gLineChart.h
@@ -53,6 +53,8 @@ public:
         return value;
     }
 
+    DottedLine& operator=(const DottedLine& other) = default;
+
     ChannelID code;
     ChannelCalcType type;
     EventDataType value;
diff --git a/oscar/SleepLib/session.h b/oscar/SleepLib/session.h
index 4350dbdc..f8e35e9b 100644
--- a/oscar/SleepLib/session.h
+++ b/oscar/SleepLib/session.h
@@ -42,6 +42,7 @@ public:
         end = copy.end;
         status = copy.status;
     }
+    SessionSlice& operator=(const SessionSlice& other) = default;
     SessionSlice(qint64 start, qint64 end, SliceStatus status):start(start), end(end), status(status) {}
 
     qint64 start;
diff --git a/oscar/statistics.h b/oscar/statistics.h
index 95dab267..0c3946da 100644
--- a/oscar/statistics.h
+++ b/oscar/statistics.h
@@ -128,6 +128,7 @@ public:
         dates = copy.dates;
         highlight = copy.highlight;
     }
+    RXItem& operator=(const RXItem& other) = default;
     inline quint64 count(ChannelID id) const {
         QHash<ChannelID, quint64>::const_iterator it = s_count.find(id);
         if (it == s_count.end()) return 0;