diff --git a/src/net/torvald/terrarum/gameworld/GameWorld.kt b/src/net/torvald/terrarum/gameworld/GameWorld.kt
index 6cc381c88..4612b37d1 100644
--- a/src/net/torvald/terrarum/gameworld/GameWorld.kt
+++ b/src/net/torvald/terrarum/gameworld/GameWorld.kt
@@ -230,7 +230,7 @@ open class GameWorld(
         }
     }
 
-    private val forcedTileNumberToNames = hashSetOf(
+    @Transient private val forcedTileNumberToNames = hashSetOf(
         Block.AIR, Block.UPDATE
     )