diff --git a/third-party/unittest/CMakeLists.txt b/third-party/unittest/CMakeLists.txt
--- a/third-party/unittest/CMakeLists.txt
+++ b/third-party/unittest/CMakeLists.txt
@@ -31,9 +31,6 @@
   add_definitions("-Wno-covered-switch-default")
 endif()
 
-set(LLVM_REQUIRES_RTTI 1)
-add_definitions( -DGTEST_HAS_RTTI=0 )
-
 if (HAVE_LIBPTHREAD)
   list(APPEND LIBS pthread)
 endif()
@@ -60,6 +57,8 @@
   set_target_properties(llvm_gtest PROPERTIES INTERFACE_COMPILE_OPTIONS "-Wno-suggest-override")
 endif()
 
+target_compile_definitions(llvm_gtest PUBLIC GTEST_HAS_RTTI=0)
+
 if (NOT LLVM_ENABLE_THREADS)
   target_compile_definitions(llvm_gtest PUBLIC GTEST_HAS_PTHREAD=0)
 endif ()