diff --git a/Minecraft.World/IO/Streams/Compression.cpp b/Minecraft.World/IO/Streams/Compression.cpp
index c7f2e463a..8e55dcd34 100644
--- a/Minecraft.World/IO/Streams/Compression.cpp
+++ b/Minecraft.World/IO/Streams/Compression.cpp
@@ -16,7 +16,7 @@
 #include "../../../Minecraft.Client/Platform/PS3/PS3Extras/EdgeZLib.h"
 #endif //__PS3__
 
-DWORD Compression::tlsIdx = 0;
+unsigned int Compression::tlsIdx = 0;
 Compression::ThreadStorage *Compression::tlsDefault = NULL;
 
 Compression::ThreadStorage::ThreadStorage()
diff --git a/Minecraft.World/IO/Streams/Compression.h b/Minecraft.World/IO/Streams/Compression.h
index 4f81cc784..f76a059af 100644
--- a/Minecraft.World/IO/Streams/Compression.h
+++ b/Minecraft.World/IO/Streams/Compression.h
@@ -27,7 +27,7 @@ private:
 		ThreadStorage();
 		~ThreadStorage();
 	};
-	static DWORD tlsIdx;
+	static unsigned int tlsIdx;
 	static ThreadStorage *tlsDefault;
 public:
 	// Each new thread that needs to use Compression will need to call one of the following 2 functions, to either create its own