diff --git a/src/video/SDL_surface.c b/src/video/SDL_surface.c
index fe916195f..00430ae3b 100644
--- a/src/video/SDL_surface.c
+++ b/src/video/SDL_surface.c
@@ -107,6 +107,7 @@ SDL_Surface * SDL_CreateRGBSurface (Uint32 flags,
 	surface->locked = 0;
 	surface->map = NULL;
 	surface->format_version = 0;
+	surface->unused1 = 0;
 	SDL_SetClipRect(surface, NULL);
 
 	/* Get the pixels */