diff --git a/gnome-quod/src/boardpanel.cc b/gnome-quod/src/boardpanel.cc
index 2289d9a..fa8c3c3 100644
--- a/gnome-quod/src/boardpanel.cc
+++ b/gnome-quod/src/boardpanel.cc
@@ -256,6 +256,8 @@ bool BoardPanel::on_expose_event (GdkEventExpose* event)
 
         return true;
     }
+
+    return false;
 }
 
 void BoardPanel::on_size_allocate (Gtk::Allocation& allocation)
diff --git a/gnome-quod/src/mainwindow.cc b/gnome-quod/src/mainwindow.cc
index 56a3d9e..e2be161 100644
--- a/gnome-quod/src/mainwindow.cc
+++ b/gnome-quod/src/mainwindow.cc
@@ -368,7 +368,7 @@ Gtk::Widget* MainWindow::BuildMenu ()
     return pWidgetMenuBar;
 }
 
-Gtk::Menu* MainWindow::BuildBgSubmenu ()
+void MainWindow::BuildBgSubmenu ()
 {
     // Create actions for menus and toolbars:
     m_refActionBgGroup = Gtk::ActionGroup::create ("UIBackground");
diff --git a/gnome-quod/src/mainwindow.h b/gnome-quod/src/mainwindow.h
index 8e3072a..91a6b36 100644
--- a/gnome-quod/src/mainwindow.h
+++ b/gnome-quod/src/mainwindow.h
@@ -89,7 +89,7 @@ private:
     Glib::RefPtr<Gtk::ToggleAction> m_refPanelToggle;
 
     Gtk::Widget* BuildMenu ();
-    Gtk::Menu* BuildBgSubmenu ();
+    void BuildBgSubmenu ();
     virtual void on_menu_game_new ();
     virtual void on_menu_game_stat ();
     virtual void on_menu_game_quit ();
diff --git a/gnome-quod/src/playerpanel.cc b/gnome-quod/src/playerpanel.cc
index e293834..c8a64e7 100644
--- a/gnome-quod/src/playerpanel.cc
+++ b/gnome-quod/src/playerpanel.cc
@@ -113,5 +113,7 @@ bool PlayerPanel::on_expose_event (GdkEventExpose* event)
 
         return true;
     }
+
+    return false;
 }
 
diff --git a/gnome-quod/src/statistics.cc b/gnome-quod/src/statistics.cc
index a7ad57a..f6d2180 100644
--- a/gnome-quod/src/statistics.cc
+++ b/gnome-quod/src/statistics.cc
@@ -39,12 +39,16 @@ TPlayerStat::TPlayerStat (const TPlayerStat& o)
 
 TPlayerStat& TPlayerStat::operator = (const TPlayerStat& o)
 {
+    if (&o == this) return *this;
+
     human_human = o.human_human;
     human_easy = o.human_easy;
     human_hard = o.human_hard;
     easy_easy = o.easy_easy;
     easy_hard = o.easy_hard;
     hard_hard = o.hard_hard;
+
+    return *this;
 }
 
 TPlayerStat::~TPlayerStat () { }
@@ -61,10 +65,14 @@ TStatistics::TStatistics (const TStatistics& o)
 
 TStatistics& TStatistics::operator = (const TStatistics& o)
 {
+    if (&o == this) return *this;
+
     blue_blue = o.blue_blue;
     blue_red = o.blue_red;
     red_blue = o.red_blue;
     red_red = o.red_red;
+
+    return *this;
 }
 
 const Glib::ustring TStatistics::FILENAME_STATISTICS = "statistics.xml";