diff --git a/src/core/data/ions/ions.hpp b/src/core/data/ions/ions.hpp
index 7affea807..9182dabde 100644
--- a/src/core/data/ions/ions.hpp
+++ b/src/core/data/ions/ions.hpp
@@ -228,7 +228,7 @@ namespace core
             typename HybridQuantity::Scalar qty;
         };
 
-        using MomentProperties = std::array<MomentsProperty, 1>;
+        using MomentProperties = std::array<MomentsProperty, 2>;
 
         NO_DISCARD MomentProperties getFieldNamesAndQuantities() const
         {