diff --git a/pkgs/tools/archivers/atool/default.nix b/pkgs/tools/archivers/atool/default.nix
index 8303a1b4277b..daeaec9de3b2 100644
--- a/pkgs/tools/archivers/atool/default.nix
+++ b/pkgs/tools/archivers/atool/default.nix
@@ -17,5 +17,6 @@ stdenv.mkDerivation rec {
     description = "Archive command line helper";
     platforms = lib.platforms.unix;
     license = lib.licenses.gpl3;
+    mainProgram = "atool";
   };
 }