diff --git a/src/kernel/Communicator.cc b/src/kernel/Communicator.cc
index f85445dd..6b22e7fa 100644
--- a/src/kernel/Communicator.cc
+++ b/src/kernel/Communicator.cc
@@ -476,11 +476,7 @@ void Communicator::shutdown_service(CommService *service)
 }
 
 #ifndef IOV_MAX
-# ifdef UIO_MAXIOV
-#  define IOV_MAX	UIO_MAXIOV
-# else
-#  define IOV_MAX	1024
-# endif
+# define IOV_MAX	16
 #endif
 
 int Communicator::send_message_sync(struct iovec vectors[], int cnt,
diff --git a/src/kernel/poller.c b/src/kernel/poller.c
index 6236d31f..85b70b8b 100644
--- a/src/kernel/poller.c
+++ b/src/kernel/poller.c
@@ -506,11 +506,7 @@ static void __poller_handle_read(struct __poller_node *node,
 }
 
 #ifndef IOV_MAX
-# ifdef UIO_MAXIOV
-#  define IOV_MAX	UIO_MAXIOV
-# else
-#  define IOV_MAX	1024
-# endif
+# define IOV_MAX	16
 #endif
 
 static void __poller_handle_write(struct __poller_node *node,