diff --git a/pkgs/os-specific/linux/iptstate/default.nix b/pkgs/os-specific/linux/iptstate/default.nix
index cd290113e00e..529a82e96469 100644
--- a/pkgs/os-specific/linux/iptstate/default.nix
+++ b/pkgs/os-specific/linux/iptstate/default.nix
@@ -17,6 +17,7 @@ stdenv.mkDerivation rec {
     platforms = platforms.linux;
     maintainers = with maintainers; [ trevorj ];
     downloadPage = "https://github.com/jaymzh/iptstate/releases";
+    license = licenses.zlib;
   };
 
   installPhase = ''