diff --git a/tests/test_RestartSerialization.cpp b/tests/test_RestartSerialization.cpp
index f5709482a53..ca11a9b6986 100644
--- a/tests/test_RestartSerialization.cpp
+++ b/tests/test_RestartSerialization.cpp
@@ -402,7 +402,7 @@ class GenericTracerModelTest : public Opm::GenericTracerModel<Grid,GridView,DofM
                             const std::function<std::array<double,Grid::dimensionworld>(int)> centroids)
     {
         GenericTracerModelTest result(gridView, eclState, cartMapper, dofMapper, centroids);
-        result.tracerConcentration_ = {{1.0}, {2.0}, {3.0}};
+        result.tracerConcentration_ = {{{1.0, 2.0}}, {{3.0, 4.0}}, {{5.0, 6.0}}};
         result.wellTracerRate_.insert({{"foo", "bar"}, 4.0});
 
         return result;