diff --git a/nix/package.nix b/nix/package.nix
index 5557d37..112904e 100644
--- a/nix/package.nix
+++ b/nix/package.nix
@@ -67,5 +67,6 @@ stdenv.mkDerivation (finalAttrs: {
     description = "The ultimate trout population helper";
     license = lib.licenses.eupl12;
     maintainers = with lib.maintainers; [NotAShelf];
+    mainProgram = "troutbot";
   };
 })