diff --git a/gdk/quartz/GdkQuartzNSWindow.c b/gdk/quartz/GdkQuartzNSWindow.c
index b5eaae2..264b565 100644
--- a/gdk/quartz/GdkQuartzNSWindow.c
+++ b/gdk/quartz/GdkQuartzNSWindow.c
@@ -62,6 +62,18 @@
   gdk_synthesize_window_state (window, GDK_WINDOW_STATE_ICONIFIED, 0);
 }
 
+-(void)windowDidEnterFullScreen:(NSNotification *)aNotification
+{
+    GdkWindow *window = [[self contentView] gdkWindow];
+    gdk_synthesize_window_state (window, 0, GDK_WINDOW_STATE_FULLSCREEN);
+}
+
+-(void)windowDidExitFullScreen:(NSNotification *)aNotification
+{
+    GdkWindow* window = [[self contentView] gdkWindow];
+    gdk_synthesize_window_state (window, GDK_WINDOW_STATE_FULLSCREEN, 0);
+}
+
 -(void)windowDidBecomeKey:(NSNotification *)aNotification
 {
   GdkWindow *window = [[self contentView] gdkWindow];