diff --git a/include/SDL_video.h b/include/SDL_video.h
index 8a3c276f6..f31c00d31 100644
--- a/include/SDL_video.h
+++ b/include/SDL_video.h
@@ -268,7 +268,8 @@ typedef enum
     SDL_GL_STEREO,
     SDL_GL_MULTISAMPLEBUFFERS,
     SDL_GL_MULTISAMPLESAMPLES,
-    SDL_GL_ACCELERATED_VISUAL
+    SDL_GL_ACCELERATED_VISUAL,
+    SDL_GL_RETAINED_BACKING
 } SDL_GLattr;