diff --git a/applications/StructuralMechanicsApplication/custom_response_functions/adjoint_conditions/adjoint_semi_analytic_base_condition.cpp b/applications/StructuralMechanicsApplication/custom_response_functions/adjoint_conditions/adjoint_semi_analytic_base_condition.cpp
index 0acd2d9a574..a764dac0d8c 100644
--- a/applications/StructuralMechanicsApplication/custom_response_functions/adjoint_conditions/adjoint_semi_analytic_base_condition.cpp
+++ b/applications/StructuralMechanicsApplication/custom_response_functions/adjoint_conditions/adjoint_semi_analytic_base_condition.cpp
@@ -45,7 +45,7 @@ namespace Kratos
                 const auto& output_value = rAdjointCondition.GetValue(rVariable);
 
                 // Resize Output
-                const SizeType gauss_points_number = rAdjointCondition.GetGeometry().IntegrationPointsNumber(rAdjointCondition.GetIntegrationMethod());
+                const auto gauss_points_number = rAdjointCondition.GetGeometry().IntegrationPointsNumber(rAdjointCondition.GetIntegrationMethod());
                 if (rValues.size() != gauss_points_number) {
                     rValues.resize(gauss_points_number);
                 }