diff --git a/cmake/modules/HandleLLVMOptions.cmake b/cmake/modules/HandleLLVMOptions.cmake
index 9b98848ae70..0d39a07c522 100644
--- a/cmake/modules/HandleLLVMOptions.cmake
+++ b/cmake/modules/HandleLLVMOptions.cmake
@@ -128,7 +128,7 @@ endmacro()
 function(add_flag_or_print_warning flag name)
   check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}")
   check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}")
-  if ("C_SUPPORTS_${name}" AND "CXX_SUPPORTS_${name}")
+  if (C_SUPPORTS_${name} AND CXX_SUPPORTS_${name})
     message(STATUS "Building with ${flag}")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)