diff --git a/oscar/SleepLib/loader_plugins/resmed_EDFinfo.h b/oscar/SleepLib/loader_plugins/resmed_EDFinfo.h
index 02a9f9f4..1ba70146 100644
--- a/oscar/SleepLib/loader_plugins/resmed_EDFinfo.h
+++ b/oscar/SleepLib/loader_plugins/resmed_EDFinfo.h
@@ -145,7 +145,7 @@ public:
         date=QDate();
     }
     
-    STRRecord(const STRRecord & copy) = default;
+    STRRecord(const STRRecord & /*copy*/) = default;
 
 // All the data members
 
@@ -232,7 +232,7 @@ public:
         filename(QString()), days(0), edf(nullptr) {}
     STRFile(QString name, long int recCnt, ResMedEDFInfo *str) :
         filename(name), days(recCnt), edf(str) {}
-    STRFile(const STRFile & copy) = default;
+    STRFile(const STRFile & /*copy*/) = default;
 
     virtual ~STRFile() {}
 
diff --git a/oscar/SleepLib/machine_common.h b/oscar/SleepLib/machine_common.h
index 8176fb1a..adef8fcb 100644
--- a/oscar/SleepLib/machine_common.h
+++ b/oscar/SleepLib/machine_common.h
@@ -109,7 +109,7 @@ enum PRTimeModes { //:short
 
 struct MachineInfo {
     MachineInfo() { type = MT_UNKNOWN; version = 0; cap=0; }
-    MachineInfo(const MachineInfo & copy) = default;
+    MachineInfo(const MachineInfo & /*copy*/) = default;
 
     MachineInfo(MachineType type, quint32 cap, QString loadername, QString brand, QString model, QString modelnumber, QString serial, QString series, QDateTime lastimported, int version) :
         type(type), cap(cap), loadername(loadername), brand(brand), model(model), modelnumber(modelnumber), serial(serial), series(series), lastimported(lastimported), version(version) {}
diff --git a/oscar/SleepLib/schema.h b/oscar/SleepLib/schema.h
index 8fe421b5..b0ef6e7b 100644
--- a/oscar/SleepLib/schema.h
+++ b/oscar/SleepLib/schema.h
@@ -27,7 +27,7 @@ public:
         color = Qt::black;
         type = Calc_Zero;
     }
-    ChannelCalc(const ChannelCalc & copy) = default;
+    ChannelCalc(const ChannelCalc & /*copy*/) = default;
     ChannelCalc(ChannelID code, ChannelCalcType type, QColor color, bool enabled):
         code(code), type(type), color(color), enabled(enabled) {}
 
diff --git a/oscar/updateparser.h b/oscar/updateparser.h
index eaa6b3a2..6665dde7 100644
--- a/oscar/updateparser.h
+++ b/oscar/updateparser.h
@@ -43,7 +43,7 @@ class Update
   */
 struct Release {
     Release() {}
-    Release(const Release &copy) = default;
+    Release(const Release & /*copy*/) = default;
 
     Release(QString ver, QString code, UpdateStatus stat) { version = ver; codename = code; status = stat; }
     QString version;
@@ -87,7 +87,7 @@ class UpdateParser: public QXmlDefaultHandler
 class PackageUpdate {
 public:
     PackageUpdate() {}
-    PackageUpdate(const PackageUpdate & copy) = default;
+    PackageUpdate(const PackageUpdate & /*copy*/) = default;
 
     QString name;
     QString displayName;