diff --git a/src/utils/enum_set.h b/src/utils/enum_set.h
index 87da779..d93a232 100644
--- a/src/utils/enum_set.h
+++ b/src/utils/enum_set.h
@@ -36,6 +36,10 @@
   /// Constructor. Initializes the EnumSet with zero.
   constexpr EnumSet() = default;
 
+  /// Copy constructor.
+  /// @param s the set to copy
+  constexpr EnumSet(const EnumSet& s) = default;
+
   /// Constructor. Initializes the EnumSet with the given values.
   /// @param values the enumerator values to construct the set with
   template <typename... VALUES>