diff --git a/inc/lzy.h b/inc/lzy.h
index 99603fa..44300a6 100644
--- a/inc/lzy.h
+++ b/inc/lzy.h
@@ -442,6 +442,7 @@ static const SDL_Scancode sc[LZYK_COUNT] = {
     SDL_SCANCODE_LEFT, SDL_SCANCODE_RIGHT, SDL_SCANCODE_UP,
     SDL_SCANCODE_DOWN, SDL_SCANCODE_Z,     SDL_SCANCODE_X,
 };
+static const SDL_Scancode fullscreen_sc = SDL_SCANCODE_F11;
 static const char *error = NULL;
 static SDL_Window *window = NULL;
 static SDL_Renderer *renderer = NULL;
@@ -912,6 +913,15 @@ int LZY_PollEvent(LZY_Event *e) {
 						return 1;
 					}
 				}
+				if (sdl_e.key.keysym.scancode ==
+				    fullscreen_sc) {
+					const unsigned int flag =
+					    SDL_WINDOW_FULLSCREEN;
+					const unsigned int fullscreen =
+					    SDL_GetWindowFlags(window) & flag;
+					SDL_SetWindowFullscreen(window,
+					                        !fullscreen);
+				}
 			}
 			return -1;
 		}