diff --git a/pkgs/applications/editors/mg/default.nix b/pkgs/applications/editors/mg/default.nix
index 0dc52b863014..c54cd01dbf28 100644
--- a/pkgs/applications/editors/mg/default.nix
+++ b/pkgs/applications/editors/mg/default.nix
@@ -31,6 +31,7 @@ stdenv.mkDerivation rec {
     description = "Micro GNU/emacs, a portable version of the mg maintained by the OpenBSD team";
     homepage = "https://man.openbsd.org/OpenBSD-current/man1/mg.1";
     license = licenses.publicDomain;
+    mainProgram = "mg";
     platforms = platforms.all;
   };
 }