diff --git a/ui/sdl.c b/ui/sdl.c
index e6c9597d37825f266d8f84fe5f8c0818f5b762be..4acfe81867090c762cf186a7f6175bd3e17a8214 100644
--- a/ui/sdl.c
+++ b/ui/sdl.c
@@ -529,7 +529,8 @@ static void sdl_send_mouse_event(int dx, int dy, int dz, int x, int y, int state
 static void toggle_full_screen(DisplayState *ds)
 {
     gui_fullscreen = !gui_fullscreen;
-    do_sdl_resize(real_screen->w, real_screen->h, real_screen->format->BitsPerPixel);
+    do_sdl_resize(ds_get_width(ds), ds_get_height(ds),
+                  ds_get_bits_per_pixel(ds));
     if (gui_fullscreen) {
         scaling_active = 0;
         gui_saved_grab = gui_grab;