diff --git a/cpp/examples/CMakeLists.txt b/cpp/examples/CMakeLists.txt
index 112f539977..79d8e66765 100644
--- a/cpp/examples/CMakeLists.txt
+++ b/cpp/examples/CMakeLists.txt
@@ -15,3 +15,10 @@
 add_executable(basic_io basic_io.cpp)
 target_include_directories(basic_io PRIVATE ../include ${cuFile_INCLUDE_DIRS})
 target_link_libraries(basic_io PRIVATE kvikio CUDA::cudart)
+
+if(CMAKE_COMPILER_IS_GNUCXX)
+  set(KVIKIO_CXX_FLAGS "-Wall;-Werror;-Wno-unknown-pragmas")
+  target_compile_options(
+    basic_io PRIVATE "$<$<COMPILE_LANGUAGE:CXX>:${KVIKIO_CXX_FLAGS}>"
+ )
+endif()
diff --git a/cpp/include/kvikio/utils.hpp b/cpp/include/kvikio/utils.hpp
index 69b91b459f..2ecd0f6fff 100644
--- a/cpp/include/kvikio/utils.hpp
+++ b/cpp/include/kvikio/utils.hpp
@@ -36,7 +36,7 @@ inline constexpr std::size_t page_size = 4096;
 
 [[nodiscard]] inline off_t convert_size2off(std::size_t x)
 {
-  if (x >= std::numeric_limits<off_t>::max()) {
+  if (x >= static_cast<std::size_t>(std::numeric_limits<off_t>::max())) {
     throw CUfileException("size_t argument too large to fit off_t");
   }
   return static_cast<off_t>(x);