diff --git a/clang/unittests/Basic/CMakeLists.txt b/clang/unittests/Basic/CMakeLists.txt
index 058243fd3fdba..016b6d5ddcb7b 100644
--- a/clang/unittests/Basic/CMakeLists.txt
+++ b/clang/unittests/Basic/CMakeLists.txt
@@ -21,3 +21,4 @@ add_distinct_clang_unittest(BasicTests
   Support
   TargetParser
   )
+target_compile_options(BasicTests PRIVATE "$<$<CXX_COMPILER_ID:MSVC>:/utf-8>")