diff --git a/pkgs/by-name/mi/mission-planner/package.nix b/pkgs/by-name/mi/mission-planner/package.nix
index fcc76a92180a..662ae3430fa9 100644
--- a/pkgs/by-name/mi/mission-planner/package.nix
+++ b/pkgs/by-name/mi/mission-planner/package.nix
@@ -46,7 +46,7 @@ stdenv.mkDerivation rec {
     runHook postUnpack
   '';
 
-  AOT_FILES = [
+  env.AOT_FILES = toString [
     "MissionPlanner.exe"
     "MissionPlanner.*.dll"
   ];