diff --git a/compiler-rt/test/tsan/CMakeLists.txt b/compiler-rt/test/tsan/CMakeLists.txt
--- a/compiler-rt/test/tsan/CMakeLists.txt
+++ b/compiler-rt/test/tsan/CMakeLists.txt
@@ -41,6 +41,10 @@
   string(REPLACE ";" " " LIBDISPATCH_CFLAGS_STRING " ${COMPILER_RT_TEST_LIBDISPATCH_CFLAGS}")
   string(APPEND TSAN_TEST_TARGET_CFLAGS ${LIBDISPATCH_CFLAGS_STRING})
 
+  if (COMPILER_RT_HAS_MSSE4_2_FLAG)
+    string(APPEND TSAN_TEST_TARGET_CFLAGS " -msse4.2 ")
+  endif()
+
   string(TOUPPER ${arch} ARCH_UPPER_CASE)
   set(CONFIG_NAME ${ARCH_UPPER_CASE}Config)