diff --git a/pkgs/by-name/xo/xosview2/package.nix b/pkgs/by-name/xo/xosview2/package.nix
index bd4234bae190..7df6f8385939 100644
--- a/pkgs/by-name/xo/xosview2/package.nix
+++ b/pkgs/by-name/xo/xosview2/package.nix
@@ -36,6 +36,7 @@ stdenv.mkDerivation (finalAttrs: {
       monitor what is going on.
     '';
     license = with licenses; [ gpl2 bsdOriginal ];
+    mainProgram = "xosview2";
     maintainers = with maintainers; [ AndersonTorres ];
     platforms = platforms.all;
   };