diff --git a/pkgs/development/python-modules/nxt-python/default.nix b/pkgs/development/python-modules/nxt-python/default.nix
index 880111a4ed75..32c07360b522 100644
--- a/pkgs/development/python-modules/nxt-python/default.nix
+++ b/pkgs/development/python-modules/nxt-python/default.nix
@@ -24,7 +24,7 @@ buildPythonPackage rec {
   meta = with lib; {
     description = "Python driver/interface for Lego Mindstorms NXT robot";
     homepage = "https://github.com/schodet/nxt-python";
-    license = licenses.gpl3;
+    license = licenses.gpl3Only;
     maintainers = with maintainers; [ ibizaman ];
   };
 }