diff --git a/src/xdp-utils.c b/src/xdp-utils.c
index 9c645e0f8..d0966376c 100644
--- a/src/xdp-utils.c
+++ b/src/xdp-utils.c
@@ -2398,6 +2398,7 @@ xdp_validate_serialized_icon (GVariant  *v,
   if (!g_spawn_check_exit_status (status, &error))
     {
       g_warning ("Icon validation: %s", error->message);
+      g_warning ("stderr:\n%s\n", stderrlog);
       return FALSE;
     }