diff --git a/Sofa/framework/Type/src/sofa/type/fixed_array.h b/Sofa/framework/Type/src/sofa/type/fixed_array.h
index ec1e711ca9d..edbffaa367d 100644
--- a/Sofa/framework/Type/src/sofa/type/fixed_array.h
+++ b/Sofa/framework/Type/src/sofa/type/fixed_array.h
@@ -83,18 +83,16 @@ class fixed_array
     constexpr fixed_array() {}
 
     /// Specific constructor for 1-element vectors.
-    template<size_type NN = N, typename std::enable_if<NN == 1, int>::type = 0>
     explicit constexpr fixed_array(value_type r1) noexcept
+    requires (N == 1)
     {
         elems[0] = r1;
     }
 
-    template<typename... ArgsT,
-        typename = std::enable_if_t< (std::is_convertible_v<ArgsT, value_type> && ...) >,
-        typename = std::enable_if_t< (sizeof...(ArgsT) == N && sizeof...(ArgsT) > 1) >
-    >
+    template<typename... ArgsT>
     constexpr fixed_array(ArgsT&&... r) noexcept
-        : elems{static_cast<value_type>(std::forward< ArgsT >(r))...}
+        requires ((std::convertible_to<ArgsT, value_type> && ...) && sizeof...(ArgsT) == N && sizeof...(ArgsT) > 1)
+        : elems{static_cast<value_type>(std::forward<ArgsT>(r))...}
     {}
 
     // iterator support