diff --git a/furvm/include/furvm/handle.hpp b/furvm/include/furvm/handle.hpp
index 7b2d899..0dbcda1 100644
--- a/furvm/include/furvm/handle.hpp
+++ b/furvm/include/furvm/handle.hpp
@@ -180,8 +180,8 @@ public:
      *
      * @return The reference count.
      */
-    template <typename ReferenceCount = typename Header::refcount_type>
-    ReferenceCount reference_count() const {
+    template <typename U = Header, typename = std::enable_if_t<detail::header_has_refcount_v<U>>>
+    auto reference_count() const {
         return m_value->first.reference_count();
     }