diff --git a/GUI/Model/Sample/ParticleItem.cpp b/GUI/Model/Sample/ParticleItem.cpp
index 380bd82e1a0f9cd2044a33243f5cac48088f23b8..4a045060d90bb462d7311779d1f4c96a7623bda7 100644
--- a/GUI/Model/Sample/ParticleItem.cpp
+++ b/GUI/Model/Sample/ParticleItem.cpp
@@ -41,6 +41,7 @@ ParticleItem::ParticleItem() : ItemWithParticles(abundance_tooltip, position_too
 void ParticleItem::serialize(Serializer& s)
 {
     s.assertVersion(0);
+    s.rw("MaterialIdentifier", m_materialIdentifier);
     s.rw(m_abundance);
     s.rw(m_position);
     s.rw<RotationItemCatalog>(m_rotation);