diff --git a/MaterialLib/FractureModels/FractureIdentity2.h b/MaterialLib/FractureModels/FractureIdentity2.h
index d0b683007b11c1b2831c55d6ca61d799ac27a5ff..431a387bf3bc2c3a8d0dd2df31382188a33287db 100644
--- a/MaterialLib/FractureModels/FractureIdentity2.h
+++ b/MaterialLib/FractureModels/FractureIdentity2.h
@@ -27,6 +27,9 @@ struct FractureIdentity2
     static VectorType const value;
 };
 
+extern template struct FractureIdentity2<2>;
+extern template struct FractureIdentity2<3>;
+
 }  // namespace Fracture
 }  // namespace MaterialLib