diff --git a/lib/std/threads/fixed_pool.c3 b/lib/std/threads/fixed_pool.c3
index 7fb72e9b6..84444a2e5 100644
--- a/lib/std/threads/fixed_pool.c3
+++ b/lib/std/threads/fixed_pool.c3
@@ -1,4 +1,4 @@
-module std::thread::threadpool;
+module std::thread::threadpool @if (env::POSIX || env::WIN32);
 import std::thread;
 
 fault ThreadPoolResult