diff --git a/SDL/gui.c b/SDL/gui.c
index 1664e74..db72c4d 100644
--- a/SDL/gui.c
+++ b/SDL/gui.c
@@ -1019,8 +1019,8 @@ void run_gui(bool is_running)
                     else {
                         SDL_SetWindowFullscreen(window, 0);
                     }
+                    update_viewport();
                 }
-                break;
                 if (event.key.keysym.scancode == SDL_SCANCODE_O) {
                     if (event.key.keysym.mod & MODIFIER) {
                         char *filename = do_open_rom_dialog();
diff --git a/SDL/main.c b/SDL/main.c
index a095064..51e7c1a 100755
--- a/SDL/main.c
+++ b/SDL/main.c
@@ -274,6 +274,7 @@ static void handle_events(GB_gameboy_t *gb)
                             else { 
                                 SDL_SetWindowFullscreen(window, 0);
                             }
+                            update_viewport();
                         }
                         break;