--- a/src/os/unix/ngx_sendv.c
+++ b/src/os/unix/ngx_sendv.c
@@ -1,15 +1,18 @@
 
+#include <ngx_core.h>
 #include <ngx_types.h>
 #include <ngx_socket.h>
 #include <ngx_sendv.h>
 
 ssize_t ngx_sendv(ngx_socket_t s, ngx_iovec_t *iovec, int n, size_t *sent)
 {
-     ssize_t rc = writev(s, iovec, n);
+     ssize_t rc;
+
+     rc = writev(s, iovec, n);
 
      if (rc == -1)
-         return -1;
+         return NGX_ERROR;
 
      *sent = rc;
-     return 0;
+     return NGX_OK;
 }