diff --git a/src/vnet/pg/input.c b/src/vnet/pg/input.c
index 14c8b98..6f38ed0 100644
--- a/src/vnet/pg/input.c
+++ b/src/vnet/pg/input.c
@@ -965,7 +965,7 @@
   if (vec_len (unused_buffers) > 0)
     {
       vlib_buffer_free_no_next (vm, unused_buffers, vec_len (unused_buffers));
-      _vec_len (unused_buffers) = 0;
+      vec_set_len (unused_buffers, 0);
     }
 }