diff --git a/include/wx/generic/grid.h b/include/wx/generic/grid.h
index 481a081a94..4f59d26784 100644
--- a/include/wx/generic/grid.h
+++ b/include/wx/generic/grid.h
@@ -811,7 +811,7 @@ public:
 
     // these are pure virtual in wxGridTableBase
     //
-    virtual int GetNumberRows() { return m_data.size(); }
+    virtual int GetNumberRows() { return static_cast<int>(m_data.size()); }
     virtual int GetNumberCols() { return m_numCols; }
     virtual wxString GetValue( int row, int col );
     virtual void SetValue( int row, int col, const wxString& s );
diff --git a/include/wx/headerctrl.h b/include/wx/headerctrl.h
index 9555e26155..08940d5b21 100644
--- a/include/wx/headerctrl.h
+++ b/include/wx/headerctrl.h
@@ -352,7 +352,10 @@ private:
     void Init();
 
     // bring the column count in sync with the number of columns we store
-    void UpdateColumnCount() { SetColumnCount(m_cols.size()); }
+    void UpdateColumnCount()
+    {
+        SetColumnCount(static_cast<int>(m_cols.size()));
+    }
 
 
     // all our current columns
diff --git a/include/wx/propgrid/props.h b/include/wx/propgrid/props.h
index 66d625a24d..5d5528e44a 100644
--- a/include/wx/propgrid/props.h
+++ b/include/wx/propgrid/props.h
@@ -564,7 +564,7 @@ public:
     // helpers
     size_t GetItemCount() const { return m_choices.GetCount(); }
     const wxString& GetLabel( size_t ind ) const
-        { return m_choices.GetLabel(ind); }
+        { return m_choices.GetLabel(static_cast<int>(ind)); }
 
 protected:
     // Used to detect if choices have been changed