diff --git a/ProcessLib/HydroMechanics/HydroMechanicsFEM-impl.h b/ProcessLib/HydroMechanics/HydroMechanicsFEM-impl.h
index 061901d7b4d91fb90697aba491bf9b9dd0497270..ae4b67894022f89226832415e02b83a5885ce965 100644
--- a/ProcessLib/HydroMechanics/HydroMechanicsFEM-impl.h
+++ b/ProcessLib/HydroMechanics/HydroMechanicsFEM-impl.h
@@ -335,7 +335,6 @@ void HydroMechanicsLocalAssembler<ShapeFunctionDisplacement,
         if constexpr (pressure_size == displacement_size)
         {
             Kpu = Kpu.colwise().sum().eval().asDiagonal();
-            Kpu_k = Kpu_k.colwise().sum().eval().asDiagonal();
         }
     }