diff --git a/example/ex3/ex3.cpp b/example/ex3/ex3.cpp
index 36073e1a..fd1faebb 100644
--- a/example/ex3/ex3.cpp
+++ b/example/ex3/ex3.cpp
@@ -13,8 +13,8 @@ main () {
     using xo::flatstring;
     using namespace std;
 
-    constexpr stdquantity<double, u::second> t = q::minutes(2);
-    constexpr stdquantity<double, u::meter> d = q::kilometers(2.5);
+    constexpr stdquantity<u::second, double> t = q::minutes(2);
+    constexpr stdquantity<u::meter, double> d = q::kilometers(2.5);
 
     constexpr auto t2 = t*t;
     constexpr auto a = d / (t*t);
diff --git a/include/xo/unit/quantity.hpp b/include/xo/unit/quantity.hpp
index f063c277..e1de9279 100644
--- a/include/xo/unit/quantity.hpp
+++ b/include/xo/unit/quantity.hpp
@@ -158,8 +158,8 @@ namespace xo {
             Repr scale_ = Repr{};
         };
 
-        template <typename Repr = double,
-                  natural_unit<std::int64_t> NaturalUnit = natural_unit<std::int64_t>()>
+        template < natural_unit<std::int64_t> NaturalUnit = natural_unit<std::int64_t>(),
+                   typename Repr = double >
         using stdquantity = quantity<NaturalUnit, Repr>;
 
         template <typename Quantity, typename Int, typename Int2x>