diff --git a/pkgs/tools/X11/xsecurelock/default.nix b/pkgs/tools/X11/xsecurelock/default.nix
index ab8bbf67ca66..25cd8cc24ced 100644
--- a/pkgs/tools/X11/xsecurelock/default.nix
+++ b/pkgs/tools/X11/xsecurelock/default.nix
@@ -43,5 +43,6 @@ stdenv.mkDerivation rec {
     license = licenses.asl20;
     maintainers = with maintainers; [ fpletz ];
     platforms = platforms.unix;
+    mainProgram = "xsecurelock";
   };
 }