diff --git a/libcxx/include/__config b/libcxx/include/__config
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -1115,6 +1115,7 @@
     !defined(_LIBCPP_HAS_THREAD_API_WIN32) && \
     !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
 #  if defined(__FreeBSD__) || \
+      defined(__Fuchsia__) || \
       defined(__wasi__) || \
       defined(__NetBSD__) || \
       defined(__linux__) || \
@@ -1124,8 +1125,6 @@
       defined(__sun__) || \
       (defined(__MINGW32__) && __has_include(<pthread.h>))
 #    define _LIBCPP_HAS_THREAD_API_PTHREAD
-#  elif defined(__Fuchsia__)
-#    define _LIBCPP_HAS_THREAD_API_C11
 #  elif defined(_LIBCPP_WIN32API)
 #    define _LIBCPP_HAS_THREAD_API_WIN32
 #  else