diff --git a/src/video/x11/SDL_x11dyn.c b/src/video/x11/SDL_x11dyn.c
index 7ada7d44e..ef401d752 100644
--- a/src/video/x11/SDL_x11dyn.c
+++ b/src/video/x11/SDL_x11dyn.c
@@ -55,6 +55,9 @@ typedef struct
 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT
 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT NULL
 #endif
+#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS
+#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS NULL
+#endif
 
 static x11dynlib x11libs[] = {
     {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC},