diff --git a/src/video/dummy/SDL_nullvideo.c b/src/video/dummy/SDL_nullvideo.c
index 962f55e57..537b05623 100644
--- a/src/video/dummy/SDL_nullvideo.c
+++ b/src/video/dummy/SDL_nullvideo.c
@@ -42,6 +42,7 @@ static char rcsid =
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 #include "SDL.h"
 #include "SDL_error.h"