diff --git a/sdl/sdl-display.h b/sdl/sdl-display.h
index 77b15a2..ec6ac1f 100644
--- a/sdl/sdl-display.h
+++ b/sdl/sdl-display.h
@@ -4,7 +4,6 @@
 #include <stdlib.h>
 
 #include <SDL.h>
-#include <SDL_mutex.h>
 #include <SDL_events.h>
 
 #include "physicaldisplay.h"