diff --git a/NewKernel_d/include/CGAL/NewKernel_d/LA_eigen/constructors.h b/NewKernel_d/include/CGAL/NewKernel_d/LA_eigen/constructors.h
index 9fb8ef02107..1bb4b2a33ef 100644
--- a/NewKernel_d/include/CGAL/NewKernel_d/LA_eigen/constructors.h
+++ b/NewKernel_d/include/CGAL/NewKernel_d/LA_eigen/constructors.h
@@ -91,11 +91,9 @@ namespace CGAL {
     };
 
     struct Initializer_list {
-      // Fix T==NT?
-      template<class T>
-        result_type operator()(std::initializer_list<T> l) const {
-          return Iterator()(l.size(),l.begin(),l.end());
-        }
+      result_type operator()(std::initializer_list<NT> l) const {
+        return Iterator()(l.size(),l.begin(),l.end());
+      }
     };
 
     struct Values {
diff --git a/Number_types/include/CGAL/Interval_nt.h b/Number_types/include/CGAL/Interval_nt.h
index ec9f7288966..8a51e7cd860 100644
--- a/Number_types/include/CGAL/Interval_nt.h
+++ b/Number_types/include/CGAL/Interval_nt.h
@@ -1594,6 +1594,16 @@ namespace Eigen {
     };
   };
 
+  template<class A, class B, class C>struct ScalarBinaryOpTraits;
+  template<bool b, typename BinaryOp>
+    struct ScalarBinaryOpTraits<CGAL::Interval_nt<b>, double, BinaryOp> {
+      typedef CGAL::Interval_nt<b> ReturnType;
+    };
+  template<bool b, typename BinaryOp>
+    struct ScalarBinaryOpTraits<double, CGAL::Interval_nt<b>, BinaryOp> {
+      typedef CGAL::Interval_nt<b> ReturnType;
+    };
+
   namespace internal {
     template<class> struct significant_decimals_impl;
     template<bool b>