diff --git a/gdk/quartz/gdkscreen-quartz.c b/gdk/quartz/gdkscreen-quartz.c
index 84269f5999..e83c87b958 100644
--- a/gdk/quartz/gdkscreen-quartz.c
+++ b/gdk/quartz/gdkscreen-quartz.c
@@ -427,6 +427,35 @@ gdk_quartz_screen_get_monitor_workarea (GdkScreen    *screen,
   GDK_QUARTZ_RELEASE_POOL;
 }
 
+/* Protocol to build cleanly for OSX < 10.7 */
+@protocol ScaleFactor
+- (CGFloat) backingScaleFactor;
+@end
+
+gint
+_gdk_quartz_screen_get_monitor_scale_factor (GdkScreen *screen,
+                                             gint       monitor_num)
+{
+  GdkQuartzScreen *quartz_screen;
+  NSArray *array;
+  NSScreen *nsscreen;
+  gint scale_factor = 1;
+
+  quartz_screen = GDK_QUARTZ_SCREEN (screen);
+
+  GDK_QUARTZ_ALLOC_POOL;
+
+  array = [NSScreen screens];
+  nsscreen = [array objectAtIndex:monitor_num];
+
+  if (gdk_quartz_osx_version() >= GDK_OSX_LION)
+    scale_factor = [(id <ScaleFactor>) nsscreen backingScaleFactor];
+
+  GDK_QUARTZ_RELEASE_POOL;
+
+  return scale_factor;
+}
+
 static gchar *
 gdk_quartz_screen_make_display_name (GdkScreen *screen)
 {
@@ -491,4 +520,5 @@ gdk_quartz_screen_class_init (GdkQuartzScreenClass *klass)
   screen_class->query_depths = _gdk_quartz_screen_query_depths;
   screen_class->query_visual_types = _gdk_quartz_screen_query_visual_types;
   screen_class->list_visuals = _gdk_quartz_screen_list_visuals;
+  screen_class->get_monitor_scale_factor = _gdk_quartz_screen_get_monitor_scale_factor;
 }
diff --git a/gdk/quartz/gdkwindow-quartz.c b/gdk/quartz/gdkwindow-quartz.c
index 48891abd78..d6f45bbb30 100644
--- a/gdk/quartz/gdkwindow-quartz.c
+++ b/gdk/quartz/gdkwindow-quartz.c
@@ -2901,6 +2901,26 @@ gdk_quartz_window_get_input_shape (GdkWindow *window)
   return NULL;
 }
 
+/* Protocol to build cleanly for OSX < 10.7 */
+@protocol ScaleFactor
+- (CGFloat) backingScaleFactor;
+@end
+
+static gint
+gdk_quartz_window_get_scale_factor (GdkWindow *window)
+{
+  GdkWindowImplQuartz *impl;
+
+  if (GDK_WINDOW_DESTROYED (window))
+    return 1;
+
+  impl = GDK_WINDOW_IMPL_QUARTZ (window->impl);
+
+  if (gdk_quartz_osx_version() >= GDK_OSX_LION)
+    return [(id <ScaleFactor>) impl->toplevel backingScaleFactor];
+
+  return 1;
+}
 
 static void
 gdk_window_impl_quartz_class_init (GdkWindowImplQuartzClass *klass)
@@ -2940,6 +2960,7 @@ gdk_window_impl_quartz_class_init (GdkWindowImplQuartzClass *klass)
   impl_class->get_input_shape = gdk_quartz_window_get_input_shape;
   impl_class->begin_paint_region = gdk_window_impl_quartz_begin_paint_region;
   impl_class->end_paint = gdk_window_impl_quartz_end_paint;
+  impl_class->get_scale_factor = gdk_quartz_window_get_scale_factor;
 
   impl_class->focus = gdk_quartz_window_focus;
   impl_class->set_type_hint = gdk_quartz_window_set_type_hint;