diff --git a/lua/iron/core.lua b/lua/iron/core.lua
index f387d02..26ab66b 100644
--- a/lua/iron/core.lua
+++ b/lua/iron/core.lua
@@ -663,8 +663,7 @@ core.setup = function(opts)
     }
 
 
-    (vim.api.nvim__set_hl_ns or vim.api.nvim_set_hl_ns)(config.namespace)
-    vim.api.nvim_set_hl(config.namespace, config.highlight_last, hl_cfg)
+    vim.api.nvim_set_hl(0, config.highlight_last, hl_cfg)
   end
 
   for _, command in ipairs(commands) do