diff --git a/site/zenodo_rdm/github/release.py b/site/zenodo_rdm/github/release.py
index 047f3344..579cb49a 100644
--- a/site/zenodo_rdm/github/release.py
+++ b/site/zenodo_rdm/github/release.py
@@ -112,5 +112,7 @@ def metadata(self):
             )
             # Add default license if not yet added
         if not output.get("rights"):
-            output.update({"rights": [{"id": metadata.repo_license or "cc-by-4.0"}]})
+            output.update(
+                {"rights": [{"id": metadata.repo_license.lower() or "cc-by-4.0"}]}
+            )
         return output