diff --git a/gdk/quartz/gdkevents-quartz.c b/gdk/quartz/gdkevents-quartz.c
index 51d4516973..cba9e4aa9c 100644
--- a/gdk/quartz/gdkevents-quartz.c
+++ b/gdk/quartz/gdkevents-quartz.c
@@ -306,6 +306,23 @@ get_event_mask_from_ns_event (NSEvent *nsevent)
   return 0;
 }
 
+static void
+get_window_point_from_screen_point (GdkWindow *window,
+                                    NSPoint    screen_point,
+                                    gint      *x,
+                                    gint      *y)
+{
+  NSPoint point;
+  NSWindow *nswindow;
+
+  nswindow = ((GdkWindowImplQuartz *)window->impl)->toplevel;
+
+  point = [nswindow convertScreenToBase:screen_point];
+
+  *x = point.x;
+  *y = window->height - point.y;
+}
+
 static GdkEvent *
 create_focus_event (GdkWindow *window,
 		    gboolean   in)
@@ -327,9 +344,7 @@ create_focus_event (GdkWindow *window,
 static void
 generate_motion_event (GdkWindow *window)
 {
-  NSPoint point;
   NSPoint screen_point;
-  NSWindow *nswindow;
   GdkEvent *event;
   gint x, y, x_root, y_root;
 
@@ -337,16 +352,10 @@ generate_motion_event (GdkWindow *window)
   event->any.window = NULL;
   event->any.send_event = TRUE;
 
-  nswindow = ((GdkWindowImplQuartz *)window->impl)->toplevel;
-
   screen_point = [NSEvent mouseLocation];
 
   _gdk_quartz_window_nspoint_to_gdk_xy (screen_point, &x_root, &y_root);
-
-  point = [nswindow convertScreenToBase:screen_point];
-
-  x = point.x;
-  y = window->height - point.y;
+  get_window_point_from_screen_point (window, screen_point, &x, &y);
 
   event->any.type = GDK_MOTION_NOTIFY;
   event->motion.window = window;
@@ -411,9 +420,7 @@ _gdk_quartz_events_update_focus_window (GdkWindow *window,
 void
 _gdk_quartz_events_send_enter_notify_event (GdkWindow *window)
 {
-  NSPoint point;
   NSPoint screen_point;
-  NSWindow *nswindow;
   GdkEvent *event;
   gint x, y, x_root, y_root;
 
@@ -421,16 +428,10 @@ _gdk_quartz_events_send_enter_notify_event (GdkWindow *window)
   event->any.window = NULL;
   event->any.send_event = FALSE;
 
-  nswindow = ((GdkWindowImplQuartz *)window->impl)->toplevel;
-
   screen_point = [NSEvent mouseLocation];
 
   _gdk_quartz_window_nspoint_to_gdk_xy (screen_point, &x_root, &y_root);
-
-  point = [nswindow convertScreenToBase:screen_point];
-
-  x = point.x;
-  y = window->height - point.y;
+  get_window_point_from_screen_point (window, screen_point, &x, &y);
 
   event->crossing.window = window;
   event->crossing.subwindow = NULL;
@@ -479,17 +480,7 @@ find_toplevel_under_pointer (GdkDisplay *display,
   info = _gdk_display_get_pointer_info (display, display->core_pointer);
   toplevel = info->toplevel_under_pointer;
   if (toplevel && WINDOW_IS_TOPLEVEL (toplevel))
-    {
-      NSWindow *nswindow;
-      NSPoint point;
-
-      nswindow = ((GdkWindowImplQuartz *)toplevel->impl)->toplevel;
-
-      point = [nswindow convertScreenToBase:screen_point];
-
-      *x = point.x;
-      *y = toplevel->height - point.y;
-    }
+    get_window_point_from_screen_point (toplevel, screen_point, x, y);
 
   return toplevel;
 }
@@ -600,16 +591,10 @@ find_toplevel_for_mouse_event (NSEvent    *nsevent,
         {
           /* Finally check the grab window. */
           GdkWindow *grab_toplevel;
-          NSWindow *grab_nswindow;
 
           grab_toplevel = gdk_window_get_effective_toplevel (grab->window);
-
-          grab_nswindow = ((GdkWindowImplQuartz *)grab_toplevel->impl)->toplevel;
-          point = [grab_nswindow convertScreenToBase:screen_point];
-
-          /* Note: x_root and y_root are already right. */
-          *x = point.x;
-          *y = grab_toplevel->height - point.y;
+          get_window_point_from_screen_point (grab_toplevel, screen_point,
+                                              x, y);
 
           return grab_toplevel;
         }