diff --git a/src/include/cppduals/duals/dual b/src/include/cppduals/duals/dual
index ab2141ea3..7605552d2 100644
--- a/src/include/cppduals/duals/dual
+++ b/src/include/cppduals/duals/dual
@@ -528,6 +528,7 @@ public:
     : _real(re), _dual(du) {}
 
   /// Copy construct from a dual of equal depth.
+#pragma warning (disable : 4244) /* floats are not used in HICUM */
   template<class X, CPPDUALS_ONLY_SAME_DEPTH_AS_T(T,X),
            CPPDUALS_ENABLE_IF(!is_complex<X>::value)>
   dual(const dual<X> & x)