diff --git a/loopy.c b/loopy.c
index bf503ce..b594902 100644
--- a/loopy.c
+++ b/loopy.c
@@ -850,7 +850,7 @@ static void game_set_size(drawing *dr, game_drawstate *ds,
 
 static float *game_colours(frontend *fe, int *ncolours)
 {
-    float *ret = snewn(4 * NCOLOURS, float);
+    float *ret = snewn(3 * NCOLOURS, float);
 
     frontend_default_colour(fe, &ret[COL_BACKGROUND * 3]);