diff --git a/src/tests/array/test_array_kernel.cu b/src/tests/array/test_array_kernel.cu
index edc4188c2..846c86b35 100644
--- a/src/tests/array/test_array_kernel.cu
+++ b/src/tests/array/test_array_kernel.cu
@@ -27,6 +27,8 @@ void kernel_ex(array::ArrayView<Value, RANK> dv)
     dv(3, 3, 3) += dv.data_view().template length<0>() * dv.data_view().template length<1>() * dv.data_view().template length<2>();
 #elif ATLAS_NATIVE_STORAGE_BACKEND_CUDA
     dv(3, 3, 3) += dv.shape(0) * dv.shape(1) * dv.shape(2);
+#else
+    ATLAS_ASSERT(false);
 #endif
 }
 
@@ -95,6 +97,8 @@ CASE( "test_array_loop" )
 
    ds->updateDevice();
 
+   ds->syncHostDevice(); // should not do anything
+
    auto cv = make_device_view<double, 3>(*ds);
 
    loop_kernel_ex<<<1,1>>>(cv);