diff --git a/pkgs/tools/networking/mu/default.nix b/pkgs/tools/networking/mu/default.nix
index 3259373c8603..4ed161ba355f 100644
--- a/pkgs/tools/networking/mu/default.nix
+++ b/pkgs/tools/networking/mu/default.nix
@@ -61,6 +61,7 @@ stdenv.mkDerivation rec {
     homepage = "https://www.djcbsoftware.nl/code/mu/";
     changelog = "https://github.com/djcb/mu/releases/tag/v${version}";
     maintainers = with maintainers; [ antono chvp peterhoeg ];
+    mainProgram = "mu";
     platforms = platforms.unix;
   };
 }