diff --git a/SDK/include/NDK/Components/GraphicsComponent.hpp b/SDK/include/NDK/Components/GraphicsComponent.hpp
index a7ac3ebc2..92aeeed2f 100644
--- a/SDK/include/NDK/Components/GraphicsComponent.hpp
+++ b/SDK/include/NDK/Components/GraphicsComponent.hpp
@@ -66,7 +66,7 @@ namespace Ndk
 
 			struct Renderable
 			{
-				Renderable(Nz::Matrix4f& transformMatrix) :
+				Renderable(const Nz::Matrix4f& transformMatrix) :
 				data(transformMatrix),
 				dataUpdated(false)
 				{
diff --git a/include/Nazara/Graphics/InstancedRenderable.hpp b/include/Nazara/Graphics/InstancedRenderable.hpp
index d1c07bf9b..d854a41d6 100644
--- a/include/Nazara/Graphics/InstancedRenderable.hpp
+++ b/include/Nazara/Graphics/InstancedRenderable.hpp
@@ -54,7 +54,7 @@ namespace Nz
 
 			struct InstanceData
 			{
-				InstanceData(Matrix4f& referenceMatrix) :
+				InstanceData(const Matrix4f& referenceMatrix) :
 				transformMatrix(&referenceMatrix),
 				flags(0)
 				{
@@ -75,7 +75,7 @@ namespace Nz
 
 				std::vector<UInt8> data;
 				BoundingVolumef volume;
-				Matrix4f* transformMatrix;
+				const Matrix4f* transformMatrix;
 				UInt32 flags;
 				int renderOrder;
 			};