1 files changed, 6 insertions, 0 deletions
diff --git a/nullgame.c b/nullgame.c
index 49173b6..3bcfe46 100644
--- a/nullgame.c
+++ b/nullgame.c
@@ -142,6 +142,11 @@ static void free_ui(game_ui *ui)
 {
 }
 
+static void game_changed_state(game_ui *ui, game_state *oldstate,
+                               game_state *newstate)
+{
+}
+
 static game_state *make_move(game_state *from, game_ui *ui, game_drawstate *ds,
                              int x, int y, int button)
 {
@@ -244,6 +249,7 @@ const struct game thegame = {
     FALSE, game_text_format,
     new_ui,
     free_ui,
+    game_changed_state,
     make_move,
     game_size,
     game_colours,