diff --git a/compiler-rt/lib/tsan/CMakeLists.txt b/compiler-rt/lib/tsan/CMakeLists.txt
index 19efb54895b5..3d53de99444d 100644
--- a/compiler-rt/lib/tsan/CMakeLists.txt
+++ b/compiler-rt/lib/tsan/CMakeLists.txt
@@ -103,7 +103,8 @@ endif()
 add_dependencies(compiler-rt tsan)
 
 # Build libcxx instrumented with TSan.
-if(COMPILER_RT_HAS_LIBCXX_SOURCES AND
+if(TSAN_SUPPORTED_ARCH AND
+   COMPILER_RT_HAS_LIBCXX_SOURCES AND
    COMPILER_RT_TEST_COMPILER_ID STREQUAL "Clang")
   set(LIBCXX_PREFIX ${CMAKE_CURRENT_BINARY_DIR}/libcxx_tsan)
   add_custom_libcxx(libcxx_tsan ${LIBCXX_PREFIX}