diff --git a/MaterialLib/SolidModels/Ehlers-impl.h b/MaterialLib/SolidModels/Ehlers-impl.h
index 8ed21d60d473c1eb71e97ad84ccf65a99487c338..b6be304df785f234cca29dbe45f858e269eb9bcf 100644
--- a/MaterialLib/SolidModels/Ehlers-impl.h
+++ b/MaterialLib/SolidModels/Ehlers-impl.h
@@ -135,6 +135,8 @@ struct PhysicalStressWithInvariants final
     double I_1;
     double J_2;
     double J_3;
+
+    EIGEN_MAKE_ALIGNED_OPERATOR_NEW;
 };
 
 /// Holds powers of 1 + gamma_p*theta to base 0, m_p, and m_p-1.
diff --git a/MaterialLib/SolidModels/Lubby2.h b/MaterialLib/SolidModels/Lubby2.h
index 42740e13ef6ce93c7f3224e0b347c3b0dfdf5756..cfdad56041e1207132744b2aaba67f2f626d601e 100644
--- a/MaterialLib/SolidModels/Lubby2.h
+++ b/MaterialLib/SolidModels/Lubby2.h
@@ -149,6 +149,8 @@ public:
         /// iteration
         KelvinVector eps_M_t;
         KelvinVector eps_M_j;
+
+        EIGEN_MAKE_ALIGNED_OPERATOR_NEW;
     };
 
     std::unique_ptr<