diff --git a/src/openrct2/core/BitSet.hpp b/src/openrct2/core/BitSet.hpp
index c682c21b82..cd198485de 100644
--- a/src/openrct2/core/BitSet.hpp
+++ b/src/openrct2/core/BitSet.hpp
@@ -307,7 +307,7 @@ namespace OpenRCT2
             return _data;
         }
 
-        constexpr Storage& data() const noexcept
+        constexpr const Storage& data() const noexcept
         {
             return _data;
         }