diff --git a/Minecraft.World/Blocks/PistonBaseTile.h b/Minecraft.World/Blocks/PistonBaseTile.h
index 48c420010..9dd9e0e15 100644
--- a/Minecraft.World/Blocks/PistonBaseTile.h
+++ b/Minecraft.World/Blocks/PistonBaseTile.h
@@ -4,12 +4,6 @@
 
 class PistonBaseTile : public Tile {
 public:
-#if defined(_WIN32)
-    using TlsKey = std::uint32_t;
-#else
-    using TlsKey = pthread_key_t;
-#endif
-
     static const int EXTENDED_BIT = 8;
     static const int UNDEFINED_FACING = 7;
 
diff --git a/Minecraft.World/Blocks/Tile.h b/Minecraft.World/Blocks/Tile.h
index 925fd477c..b46748ff5 100644
--- a/Minecraft.World/Blocks/Tile.h
+++ b/Minecraft.World/Blocks/Tile.h
@@ -50,12 +50,6 @@ class Tile {
     friend class WallTile;
 
 protected:
-#if defined(_WIN32)
-    using TlsKey = std::uint32_t;
-#else
-    using TlsKey = pthread_key_t;
-#endif
-
     // 4J added so we can have separate shapes for different threads
     class ThreadStorage {
     public:
diff --git a/Minecraft.World/Entities/Entity.h b/Minecraft.World/Entities/Entity.h
index 0a877b2f6..e7aede835 100644
--- a/Minecraft.World/Entities/Entity.h
+++ b/Minecraft.World/Entities/Entity.h
@@ -36,12 +36,6 @@ class Entity : public std::enable_shared_from_this<Entity> {
     friend class Gui;  // 4J Stu - Added to be able to access the shared flag
                        // functions and constants, without making them publicly
                        // available to everything
-public:
-#if defined(_WIN32)
-    using TlsKey = std::uint32_t;
-#else
-    using TlsKey = pthread_key_t;
-#endif
 
     // 4J-PB - added to replace (e instanceof Type), avoiding dynamic casts
     virtual eINSTANCEOF GetType() = 0;
diff --git a/Minecraft.World/Level/Storage/OldChunkStorage.h b/Minecraft.World/Level/Storage/OldChunkStorage.h
index 0b40872bd..c451d6ffd 100644
--- a/Minecraft.World/Level/Storage/OldChunkStorage.h
+++ b/Minecraft.World/Level/Storage/OldChunkStorage.h
@@ -9,13 +9,6 @@
 class Level;
 
 class OldChunkStorage : public ChunkStorage {
-public:
-#if defined(_WIN32)
-    using TlsKey = std::uint32_t;
-#else
-    using TlsKey = pthread_key_t;
-#endif
-
 private:
     // 4J added so we can have separate storage arrays for different threads
     class ThreadStorage {