diff --git a/include/Nazara/Graphics/InstancedRenderable.hpp b/include/Nazara/Graphics/InstancedRenderable.hpp
index 965b06dbb..fb41495a6 100644
--- a/include/Nazara/Graphics/InstancedRenderable.hpp
+++ b/include/Nazara/Graphics/InstancedRenderable.hpp
@@ -66,6 +66,7 @@ namespace Nz
 			// Signals:
 			NazaraSignal(OnInstancedRenderableInvalidateBoundingVolume, const InstancedRenderable* /*instancedRenderable*/);
 			NazaraSignal(OnInstancedRenderableInvalidateData, const InstancedRenderable* /*instancedRenderable*/, UInt32 /*flags*/);
+			NazaraSignal(OnInstancedRenderableInvalidateMaterial, const InstancedRenderable* /*instancedRenderable*/, std::size_t /*skinIndex*/, std::size_t /*matIndex*/, MaterialRef /*newMat*/);
 			NazaraSignal(OnInstancedRenderableRelease, const InstancedRenderable* /*instancedRenderable*/);
 
 			struct InstanceData
diff --git a/include/Nazara/Graphics/InstancedRenderable.inl b/include/Nazara/Graphics/InstancedRenderable.inl
index 62e1c8966..e30f6b3d8 100644
--- a/include/Nazara/Graphics/InstancedRenderable.inl
+++ b/include/Nazara/Graphics/InstancedRenderable.inl
@@ -230,7 +230,13 @@ namespace Nz
 		NazaraAssert(matIndex < m_materials.size(), "Material index out of bounds");
 		NazaraAssert(material.IsValid(), "Material must be valid");
 
-		m_materials[m_matCount * skinIndex + matIndex] = std::move(material);
+		MaterialRef& matEntry = m_materials[m_matCount * skinIndex + matIndex];
+		if (matEntry != material)
+		{
+			OnInstancedRenderableInvalidateMaterial(this, skinIndex, matIndex, material);
+
+			matEntry = std::move(material);
+		}
 	}
 
 	/*!