1 files changed, 1 insertions, 1 deletions
diff --git a/fifteen.c b/fifteen.c
index 5419f41..1a106e8 100644
--- a/fifteen.c
+++ b/fifteen.c
@@ -460,7 +460,7 @@ struct game_drawstate {
     int tilesize;
 };
 
-static char *interpret_move(game_state *state, game_ui *ui, game_drawstate *ds,
+static char *interpret_move(game_state *state, game_ui *ui, const game_drawstate *ds,
 			    int x, int y, int button)
 {
     int gx, gy, dx, dy;