diff --git a/libsqsh/include/sqsh_posix_private.h b/libsqsh/include/sqsh_posix_private.h
index 370e2743..f3cc7cc6 100644
--- a/libsqsh/include/sqsh_posix_private.h
+++ b/libsqsh/include/sqsh_posix_private.h
@@ -46,9 +46,10 @@ struct SqshThreadpool {
 	struct CxThreadpool pool;
 };
 
-int sqsh__threadpool_init(struct SqshThreadpool *pool, size_t threads);
+SQSH_NO_EXPORT int
+sqsh__threadpool_init(struct SqshThreadpool *pool, size_t threads);
 
-int sqsh__threadpool_cleanup(struct SqshThreadpool *pool);
+SQSH_NO_EXPORT int sqsh__threadpool_cleanup(struct SqshThreadpool *pool);
 
 #ifdef __cplusplus
 }