diff --git a/build-data/reobf-mappings-patch.tiny b/build-data/reobf-mappings-patch.tiny
index f0d89b2b67..ab01bc265d 100644
--- a/build-data/reobf-mappings-patch.tiny
+++ b/build-data/reobf-mappings-patch.tiny
@@ -14,7 +14,7 @@ tiny	2	0	mojang+yarn	spigot
 
 # CraftBukkit changes type
 c	net/minecraft/server/level/ServerLevel	net/minecraft/server/level/WorldServer
-	f	Lnet/minecraft/world/level/storage/PrimaryLevelData;	serverLevelData	N
+	f	Lnet/minecraft/world/level/storage/PrimaryLevelData;	serverLevelData	J
 
 c	net/minecraft/world/level/chunk/LevelChunk	net/minecraft/world/level/chunk/Chunk
 	f	Lnet/minecraft/server/level/ServerLevel;	level	q