diff --git a/pkgs/applications/misc/avalonia-ilspy/default.nix b/pkgs/applications/misc/avalonia-ilspy/default.nix
index f508cf566182..20914e1c90b3 100644
--- a/pkgs/applications/misc/avalonia-ilspy/default.nix
+++ b/pkgs/applications/misc/avalonia-ilspy/default.nix
@@ -95,5 +95,6 @@ stdenv.mkDerivation rec {
     license = licenses.mit;
     platforms = [ "x86_64-linux" ];
     maintainers = with lib.maintainers; [ AngryAnt ];
+    mainProgram = "ILSpy";
   };
 }