diff --git a/include/nuttx/arch.h b/include/nuttx/arch.h
index a28e271cc54..9c383de8b6f 100644
--- a/include/nuttx/arch.h
+++ b/include/nuttx/arch.h
@@ -1852,6 +1852,7 @@ int up_tls_size(void);
  ****************************************************************************/
 
 #ifdef CONFIG_SCHED_THREAD_LOCAL
+struct tls_info_s;
 void up_tls_initialize(FAR struct tls_info_s *info);
 #else
 #define up_tls_initialize(x)