diff --git a/include/sparrow/layout/dictionary_encoded_array.hpp b/include/sparrow/layout/dictionary_encoded_array.hpp
index b6e18412b..9d7815355 100644
--- a/include/sparrow/layout/dictionary_encoded_array.hpp
+++ b/include/sparrow/layout/dictionary_encoded_array.hpp
@@ -275,7 +275,7 @@ namespace sparrow
         const auto index = m_keys_layout[i];
         if (index.has_value())
         {
-            return array_element(*p_values_layout, index.value());
+            return array_element(*p_values_layout, static_cast<std::size_t>(index.value()));
         }
         else
         {