diff --git a/src/vrend_renderer.c b/src/vrend_renderer.c
index da7cbed..00b61eb 100644
--- a/src/vrend_renderer.c
+++ b/src/vrend_renderer.c
@@ -4031,6 +4031,9 @@ int vrend_renderer_resource_attach_iov(int res_handle, struct iovec *iov,
    if (!res)
       return EINVAL;
 
+   if (res->iov)
+      return 0;
+
    /* work out size and max resource size */
    res->iov = iov;
    res->num_iovs = num_iovs;