diff --git a/src/openrct2/cheats.c b/src/openrct2/cheats.c
index b524f362a8..d71df8c7d5 100644
--- a/src/openrct2/cheats.c
+++ b/src/openrct2/cheats.c
@@ -344,12 +344,12 @@ static void cheat_give_all_guests(int object)
 				break;
 			case OBJECT_BALLOON:
 				peep->item_standard_flags |= PEEP_ITEM_BALLOON;
-				peep->balloon_colour = scenario_rand_max(31);
+				peep->balloon_colour = scenario_rand_max(COLOUR_COUNT - 1);
 				peep_update_sprite_type(peep);
 				break;
 			case OBJECT_UMBRELLA:
 				peep->item_standard_flags |= PEEP_ITEM_UMBRELLA;
-				peep->umbrella_colour = scenario_rand_max(31);
+				peep->umbrella_colour = scenario_rand_max(COLOUR_COUNT - 1);
 				peep_update_sprite_type(peep);
 				break;
 		}