diff --git a/pkgs/development/python-modules/isbnlib/default.nix b/pkgs/development/python-modules/isbnlib/default.nix
index 5592f09f951f..f9e4ba6532b5 100644
--- a/pkgs/development/python-modules/isbnlib/default.nix
+++ b/pkgs/development/python-modules/isbnlib/default.nix
@@ -27,7 +27,7 @@ buildPythonPackage rec {
   meta = with lib; {
     description = "Extract, clean, transform, hyphenate and metadata for ISBNs";
     homepage = "https://github.com/xlcnd/isbnlib";
-    license = licenses.lgpl3;
+    license = licenses.lgpl3Only;
     maintainers = with maintainers; [ dotlambda ];
   };
 }