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";
   };
 }
diff --git a/pkgs/tools/compression/gzip/default.nix b/pkgs/tools/compression/gzip/default.nix
index b48e2696f09c..baff7f030387 100644
--- a/pkgs/tools/compression/gzip/default.nix
+++ b/pkgs/tools/compression/gzip/default.nix
@@ -68,5 +68,7 @@ stdenv.mkDerivation rec {
     platforms = lib.platforms.all;
 
     license = lib.licenses.gpl3Plus;
+
+    mainProgram = "gzip";
   };
 }