diff --git a/arduino-env.nix b/arduino-env.nix
index 7772b91..4a6117a 100644
--- a/arduino-env.nix
+++ b/arduino-env.nix
@@ -2,8 +2,8 @@
 
 let
   mkArduinoEnv = {
-    packages
-    , libraries
+    packages ? []
+    , libraries ? []
     , runtimeInputs ? []
   }: let
     arduino-cli = pkgs.wrapArduinoCLI {