diff --git a/pkgs/tools/archivers/unar/default.nix b/pkgs/tools/archivers/unar/default.nix
index b1c818505712..b874522d87f0 100644
--- a/pkgs/tools/archivers/unar/default.nix
+++ b/pkgs/tools/archivers/unar/default.nix
@@ -89,6 +89,7 @@ stdenv.mkDerivation rec {
     '';
     license = licenses.lgpl21Plus;
     maintainers = with maintainers; [ peterhoeg ];
+    mainProgram = "unar";
     platforms = platforms.unix;
   };
 }