diff --git a/projects/rocthrust/test/test_copy.cpp b/projects/rocthrust/test/test_copy.cpp
index 27b7818b9ba..9cc00493017 100644
--- a/projects/rocthrust/test/test_copy.cpp
+++ b/projects/rocthrust/test/test_copy.cpp
@@ -430,7 +430,7 @@ TYPED_TEST(CopyIntegerTests, TestCopyIf)
 
 TEST(CopyLargeTypesTests, TestCopyIfStencilLargeType)
 {
-  using T = large_data;
+  using T = test::large_data;
 
   SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());
 
diff --git a/projects/rocthrust/test/test_header.hpp b/projects/rocthrust/test/test_header.hpp
index 20682ef75c6..d2f0d4717fa 100644
--- a/projects/rocthrust/test/test_header.hpp
+++ b/projects/rocthrust/test/test_header.hpp
@@ -197,7 +197,8 @@ struct Params<thrust::device_vector<T>, ExecutionPolicy>
   TYPED_TEST_SUITE(x, y);
 
 // Set of test parameter types
-
+namespace test
+{
 class large_data
 {
 public:
@@ -240,6 +241,7 @@ bool __host__ __device__ operator==(T const& lhs, large_data const& rhs)
 {
   return static_cast<large_data>(lhs).data[0] == rhs.data[0];
 }
+} // namespace test
 
 // Host and device vectors of all type as a test parameter
 using FullTestsParams = ::testing::Types<
@@ -283,7 +285,7 @@ using FullWithLargeTypesTestsParams = ::testing::Types<
   Params<thrust::device_vector<float>, std::decay_t<decltype(thrust::hip::par_det)>>,
   Params<thrust::device_vector<float>, std::decay_t<decltype(thrust::hip::par_det_nosync)>>,
   Params<thrust::device_vector<double>>,
-  Params<thrust::device_vector<large_data>>>;
+  Params<thrust::device_vector<test::large_data>>>;
 
 // Host and device vectors of signed type
 using VectorSignedTestsParams =