diff --git a/sycl/test-e2e/CMakeLists.txt b/sycl/test-e2e/CMakeLists.txt
index 96018d8b30b62..2379d7859e6a5 100644
--- a/sycl/test-e2e/CMakeLists.txt
+++ b/sycl/test-e2e/CMakeLists.txt
@@ -60,7 +60,8 @@ if(MSVC AND NOT SYCL_TEST_E2E_STANDALONE)
 else()
   set(SYCL_E2E_CLANG_CXX_FLAGS ${CMAKE_CXX_FLAGS})
 endif()
-list(APPEND SYCL_E2E_CLANG_CXX_FLAGS "-Werror")
+
+set(SYCL_E2E_CLANG_CXX_FLAGS "${SYCL_E2E_CLANG_CXX_FLAGS} -Werror")
 
 if(SYCL_TEST_E2E_STANDALONE)
   configure_file("${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.py.in"
diff --git a/sycl/test-e2e/bindless_images/helpers/sampling.hpp b/sycl/test-e2e/bindless_images/helpers/sampling.hpp
index 714dc21941157..51b1a58088094 100644
--- a/sycl/test-e2e/bindless_images/helpers/sampling.hpp
+++ b/sycl/test-e2e/bindless_images/helpers/sampling.hpp
@@ -662,6 +662,7 @@ read(sycl::range<2> globalSize, sycl::vec<float, 2> coords, float offset,
     }
   }
   assert(false && "Invalid sampler encountered!");
+  return {};
 }
 
 }; // namespace sampling_helpers