diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 85c6f60..42b93f0 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -17,6 +17,7 @@
 pythonize_bool(LIBCXXABI_ENABLE_THREADS)
 pythonize_bool(LIBCXXABI_ENABLE_EXCEPTIONS)
 pythonize_bool(LIBCXXABI_USE_LLVM_UNWINDER)
+pythonize_bool(LIBCXXABI_HAS_EXTERNAL_THREAD_API)
 set(LIBCXXABI_TARGET_INFO "libcxx.test.target_info.LocalTI" CACHE STRING
     "TargetInfo to use when setting up test environment.")
 set(LIBCXXABI_EXECUTOR "None" CACHE STRING
@@ -34,6 +35,10 @@
   set(LIBCXXABI_TEST_DEPS cxxabi_static)
 endif()
 
+if (LIBCXXABI_HAS_EXTERNAL_THREAD_API)
+  list(APPEND LIBCXXABI_TEST_DEPS cxx_external_threads)
+endif()
+
 if (NOT LIBCXXABI_STANDALONE_BUILD)
   list(APPEND LIBCXXABI_TEST_DEPS cxx)
   if (LIBCXXABI_USE_LLVM_UNWINDER)