diff --git a/src/overlay_29_02338604.c b/src/overlay_29_02338604.c
index 82a93ef9..dc920b74 100644
--- a/src/overlay_29_02338604.c
+++ b/src/overlay_29_02338604.c
@@ -7,8 +7,8 @@ extern struct dungeon* DUNGEON_PTR[];
 void SetShouldBoostHiddenStairsSpawnChance(u8 should_boost)
 {
     #ifdef JAPAN
-    DUNGEON_PTR[0]->unknown_file_buffer_0x12162[0x96f]=should_boost;
+    DUNGEON_PTR[0]->boost_hidden_stairs_spawn_chance=should_boost;
     #else
-    DUNGEON_PTR[0]->unknown_file_buffer_0x12162[0x9c3]=should_boost;
+    DUNGEON_PTR[0]->boost_hidden_stairs_spawn_chance=should_boost;
     #endif
 }