diff --git a/src/posix/sdl/sdlglvideo.h b/src/posix/sdl/sdlglvideo.h
index c2be3ba47e..19e6a5ff57 100644
--- a/src/posix/sdl/sdlglvideo.h
+++ b/src/posix/sdl/sdlglvideo.h
@@ -3,6 +3,7 @@
 
 #include "hardware.h"
 #include "v_video.h"
+#include <SDL.h>
 #include "gl/system/gl_system.h"
 
 EXTERN_CVAR (Float, dimamount)