diff --git a/compiler-rt/lib/tsan/tests/CMakeLists.txt b/compiler-rt/lib/tsan/tests/CMakeLists.txt
--- a/compiler-rt/lib/tsan/tests/CMakeLists.txt
+++ b/compiler-rt/lib/tsan/tests/CMakeLists.txt
@@ -20,6 +20,8 @@
                                    -DTSAN_DEBUG_OUTPUT=2)
 endif()
 
+append_list_if(COMPILER_RT_HAS_MSSE4_2_FLAG -msse4.2 TSAN_UNITTEST_CFLAGS)
+
 set(TSAN_TEST_ARCH ${TSAN_SUPPORTED_ARCH})
 
 set(LINK_FLAGS ${COMPILER_RT_UNITTEST_LINK_FLAGS})