diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 8829e8c..d4f8f04 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -103,15 +103,7 @@
   type_printers.cpp
 )
 
-if("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
-  target_compile_options(utest_test_wpo PRIVATE "$<$<CONFIG:RELEASE>:-flto>")
-  target_link_libraries(utest_test_wpo PRIVATE "$<$<CONFIG:RELEASE>:-flto>")
-elseif("${CMAKE_C_COMPILER_ID}" STREQUAL "Clang")
-  target_compile_options(utest_test_wpo PRIVATE "$<$<CONFIG:RELEASE>:-flto>")
-  target_link_libraries(utest_test_wpo PRIVATE "$<$<CONFIG:RELEASE>:-flto>")
-elseif("${CMAKE_C_COMPILER_ID}" STREQUAL "MSVC")
+if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
   target_compile_options(utest_test_wpo PRIVATE "$<$<CONFIG:RELEASE>:/GL>")
   target_link_options(utest_test_wpo PRIVATE "$<$<CONFIG:RELEASE>:/LTCG>")
-else()
-  message(WARNING "Unknown compiler '${CMAKE_C_COMPILER_ID}'!")
 endif()