diff --git a/src/leaf_data.hpp b/src/leaf_data.hpp
index 7139fc4..1c4176e 100644
--- a/src/leaf_data.hpp
+++ b/src/leaf_data.hpp
@@ -173,6 +173,12 @@
     {
         return std::visit(*this, *leafRef.m_targetType);
     }
+    bool operator()(const yang::Union& unionInfo) const
+    {
+        return std::any_of(unionInfo.m_unionTypes.begin(), unionInfo.m_unionTypes.end(), [this](const auto& type) {
+            return std::visit(*this, type);
+        });
+    }
 };
 
 struct LeafData : x3::parser<LeafData> {