diff --git a/lua/plugins/ai-completion.lua b/lua/plugins/ai-completion.lua
index cba7ba3..a628793 100644
--- a/lua/plugins/ai-completion.lua
+++ b/lua/plugins/ai-completion.lua
@@ -1,6 +1,6 @@
 -- AI code completion
 
-if (vim.fn.getenv('COPILOT_API_KEY') ~= nil) then
+if (vim.fn.getenv('COPILOT_API_KEY') ~= vim.NIL) then
     return {
         'zbirenbaum/copilot.lua',
         event = 'InsertEnter',