diff --git a/scripts/cve_tools/add-missing-reference b/scripts/cve_tools/add-missing-reference
index 72af708..6655168 100755
--- a/scripts/cve_tools/add-missing-reference
+++ b/scripts/cve_tools/add-missing-reference
@@ -23,7 +23,8 @@ if __name__ == "__main__":
         with Patch(open(f, "r+b")) as patch:
             refs = "".join(patch.get("References"))
             refs = list(refs.replace(",", " ").split())
-            new_refs = refs + [r for r in added_refs if not r in refs]
+            refs_lower = [r.lower() for r in refs]
+            new_refs = refs + [r for r in added_refs if not r.lower() in refs_lower]
             if new_refs == refs:
                 continue
             patch.change("References", " ".join(new_refs))