diff --git a/Tests/NumLib/TestComponentNorms.cpp b/Tests/NumLib/TestComponentNorms.cpp
index 87a92a98f192040703ad924220773c709aaaf483..1d25ec27cad8273c8a7dedc572cc45b957bf05b3 100644
--- a/Tests/NumLib/TestComponentNorms.cpp
+++ b/Tests/NumLib/TestComponentNorms.cpp
@@ -48,10 +48,10 @@ struct DOFTableData
     NumLib::LocalToGlobalIndexMap const dof_table;
 
 private:
-    static const std::size_t mesh_length;
+    static const double mesh_length;
     static const std::size_t mesh_elements_in_each_direction;
 };
-const std::size_t DOFTableData::mesh_length = 1;
+const double DOFTableData::mesh_length = 1;
 const std::size_t DOFTableData::mesh_elements_in_each_direction = 5;
 
 template <typename AccumulateCallback, typename AccumulateFinishCallback>