diff --git a/include/Nazara/Utility/Skeleton.hpp b/include/Nazara/Utility/Skeleton.hpp
index ca327b96c..7832c266d 100644
--- a/include/Nazara/Utility/Skeleton.hpp
+++ b/include/Nazara/Utility/Skeleton.hpp
@@ -9,10 +9,16 @@
 
 #include <Nazara/Prerequesites.hpp>
 #include <Nazara/Core/Resource.hpp>
+#include <Nazara/Core/ResourceRef.hpp>
 #include <Nazara/Math/Box.hpp>
 #include <Nazara/Utility/Joint.hpp>
 #include <vector>
 
+class NzSkeleton;
+
+using NzSkeletonConstRef = NzResourceRef<const NzSkeleton>;
+using NzSkeletonRef = NzResourceRef<NzSkeleton>;
+
 struct NzSkeletonImpl;
 
 class NAZARA_API NzSkeleton : public NzResource