diff --git a/compiler-rt/lib/msan/tests/CMakeLists.txt b/compiler-rt/lib/msan/tests/CMakeLists.txt
--- a/compiler-rt/lib/msan/tests/CMakeLists.txt
+++ b/compiler-rt/lib/msan/tests/CMakeLists.txt
@@ -25,8 +25,6 @@
   ../../../include/sanitizer/msan_interface.h
   )
 set(MSAN_UNITTEST_COMMON_CFLAGS
-  -nostdinc++
-  -isystem ${COMPILER_RT_LIBCXX_PATH}/include
   ${COMPILER_RT_UNITTEST_CFLAGS}
   ${COMPILER_RT_GTEST_CFLAGS}
   -I${COMPILER_RT_SOURCE_DIR}/include