diff --git a/tests/generator_scripts/source/JacobiMdspan.harness.cpp b/tests/generator_scripts/source/JacobiMdspan.harness.cpp
index e2b8c716bf1427b3e915d6eb6c9756e7127df893..529d12c4f86f166084f998caf2ccd5fdc0ca59dc 100644
--- a/tests/generator_scripts/source/JacobiMdspan.harness.cpp
+++ b/tests/generator_scripts/source/JacobiMdspan.harness.cpp
@@ -5,21 +5,21 @@
 
 namespace stdex = std::experimental;
 
-using field_t = stdex::mdspan<double, stdex::extents< int64_t, std::dynamic_extent, std::dynamic_extent>>;
-using scalar_field_t = stdex::mdspan<double, stdex::extents< int64_t, std::dynamic_extent, std::dynamic_extent, 1>>;
+using field_t = stdex::mdspan<double, stdex::extents<int64_t, std::dynamic_extent, std::dynamic_extent>, stdex::layout_left>;
+using scalar_field_t = stdex::mdspan<double, stdex::extents<int64_t, std::dynamic_extent, std::dynamic_extent, 1>, stdex::layout_left>;
 
 int main(void)
 {
     auto data_f = std::make_unique<double[]>(64);
-    scalar_field_t f{ data_f.get(), 8, 8 };
+    scalar_field_t f{data_f.get(), 8, 8};
 
     auto data_u = std::make_unique<double[]>(64);
-    field_t u{ data_u.get(), 8, 8 };
+    field_t u{data_u.get(), 8, 8};
 
     auto data_u_tmp = std::make_unique<double[]>(64);
-    field_t u_tmp{ data_u_tmp.get(), 8, 8 };
+    field_t u_tmp{data_u_tmp.get(), 8, 8};
 
-    double h { 1.0 / 7.0 };
+    double h{1.0 / 7.0};
 
     gen::jacobi_smooth(f, h, u_tmp, u);
 }
diff --git a/tests/generator_scripts/source/JacobiMdspan.py b/tests/generator_scripts/source/JacobiMdspan.py
index 41f149a8b36181a75728df2aa3d5819c53be8626..35dcd43cddbffc8b028df2fa84585181a488442b 100644
--- a/tests/generator_scripts/source/JacobiMdspan.py
+++ b/tests/generator_scripts/source/JacobiMdspan.py
@@ -20,8 +20,8 @@ with SourceFileGenerator() as sfg:
     poisson_kernel = sfg.kernels.create(poisson_jacobi)
 
     sfg.function("jacobi_smooth")(
-        sfg.map_field(u_src, mdspan.from_field(u_src)),
-        sfg.map_field(u_dst, mdspan.from_field(u_dst)),
+        sfg.map_field(u_src, mdspan.from_field(u_src, layout_policy="layout_left")),
+        sfg.map_field(u_dst, mdspan.from_field(u_dst, layout_policy="layout_left")),
         sfg.map_field(f, mdspan.from_field(f)),
         sfg.call(poisson_kernel)
     )