diff --git a/include/aio.h b/include/aio.h
index 4cc04909..f28ee369 100644
--- a/include/aio.h
+++ b/include/aio.h
@@ -5,9 +5,6 @@
 extern "C" {
 #endif
 
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
-
 #include <signal.h>
 #include <time.h>
 
@@ -51,8 +48,6 @@ int aio_fsync(int, struct aiocb *);
 
 int lio_listio(int, struct aiocb *const [], int, struct sigevent *);
 
-#endif
-
 #ifdef __cplusplus
 }
 #endif