diff --git a/pkgs/by-name/xf/xfel/package.nix b/pkgs/by-name/xf/xfel/package.nix
index bd18d0ffcb5f..ca3ee9a3071a 100644
--- a/pkgs/by-name/xf/xfel/package.nix
+++ b/pkgs/by-name/xf/xfel/package.nix
@@ -32,5 +32,6 @@ stdenv.mkDerivation rec {
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ felixsinger ];
     platforms = lib.platforms.linux;
+    mainProgram = "xfel";
   };
 }