diff --git a/models/multimusicmodel.h b/models/multimusicmodel.h
index 9839f2528..73068757f 100644
--- a/models/multimusicmodel.h
+++ b/models/multimusicmodel.h
@@ -38,9 +38,9 @@ class MultiMusicModel : public MusicModel
 public:
     MultiMusicModel(QObject *parent = 0);
     ~MultiMusicModel();
-    QModelIndex index(int row, int column, const QModelIndex &parent) const;
+    QModelIndex index(int row, int column, const QModelIndex &parent=QModelIndex()) const;
     QModelIndex parent(const QModelIndex &index) const;
-    int rowCount(const QModelIndex &parent) const;
+    int rowCount(const QModelIndex &parent=QModelIndex()) const;
     void getDetails(QSet<QString> &artists, QSet<QString> &albumArtists, QSet<QString> &albums, QSet<QString> &genres);
     void toggleGrouping();
     QList<Song> songs(const QModelIndexList &indexes, bool playableOnly=false, bool fullPath=false) const;
diff --git a/models/musicmodel.h b/models/musicmodel.h
index 3880e1d1c..50a89964d 100644
--- a/models/musicmodel.h
+++ b/models/musicmodel.h
@@ -34,9 +34,9 @@ public:
     MusicModel(QObject *parent = 0);
     ~MusicModel();
     virtual const MusicLibraryItemRoot * root(const MusicLibraryItem *item) const;
-    QVariant headerData(int, Qt::Orientation, int) const { return QVariant(); }
-    int columnCount(const QModelIndex &) const { return 1; }
-    QVariant data(const QModelIndex &, int) const;
+    QVariant headerData(int, Qt::Orientation, int = Qt::DisplayRole) const { return QVariant(); }
+    int columnCount(const QModelIndex & = QModelIndex()) const { return 1; }
+    QVariant data(const QModelIndex &, int = Qt::DisplayRole) const;
 
     virtual int row(void *) const { return 0; }
 
@@ -47,4 +47,3 @@ public:
 };
 
 #endif
-