diff --git a/include/Nazara/Core/Config.hpp b/include/Nazara/Core/Config.hpp
index efc28e609..5b0b6db49 100644
--- a/include/Nazara/Core/Config.hpp
+++ b/include/Nazara/Core/Config.hpp
@@ -57,7 +57,6 @@
 #define NAZARA_CORE_THREADSAFE 1
 
 // Les classes à protéger des accès concurrentiels
-#define NAZARA_THREADSAFETY_BYTEARRAY 1    // NzByteArray (COW)
 #define NAZARA_THREADSAFETY_CLOCK 0        // NzClock
 #define NAZARA_THREADSAFETY_DIRECTORY 1    // NzDirectory
 #define NAZARA_THREADSAFETY_DYNLIB 1       // NzDynLib
@@ -65,7 +64,6 @@
 #define NAZARA_THREADSAFETY_HASHDIGEST 0   // NzHashDigest
 #define NAZARA_THREADSAFETY_LOG 1          // NzLog
 #define NAZARA_THREADSAFETY_RESOURCE 1     // NzResource
-#define NAZARA_THREADSAFETY_STRING 1       // NzString (COW)
 #define NAZARA_THREADSAFETY_STRINGSTREAM 0 // NzStringStream
 
 // Le nombre de spinlocks à utiliser avec les critical sections de Windows (0 pour désactiver)
diff --git a/include/Nazara/Utility/Config.hpp b/include/Nazara/Utility/Config.hpp
index 4ec12e9c1..27311b6fa 100644
--- a/include/Nazara/Utility/Config.hpp
+++ b/include/Nazara/Utility/Config.hpp
@@ -48,10 +48,6 @@
 #define NAZARA_UTILITY_THREADED_WINDOW 0
 
 // Protège les classes des accès concurrentiels
-#define NAZARA_UTILITY_THREADSAFE 1
-
-// Les classes à protéger des accès concurrentiels
-#define NAZARA_THREADSAFETY_IMAGE             1 // NzImage (COW)
-#define NAZARA_THREADSAFETY_VERTEXDECLARATION 1 // NzVertexDeclaration (COW)
+//#define NAZARA_UTILITY_THREADSAFE 1
 
 #endif // NAZARA_CONFIG_UTILITY_HPP