diff --git a/test/unit_test/static/quantity_test.cpp b/test/unit_test/static/quantity_test.cpp
index cecaf798..a0d55d13 100644
--- a/test/unit_test/static/quantity_test.cpp
+++ b/test/unit_test/static/quantity_test.cpp
@@ -54,10 +54,6 @@ namespace {
     constexpr operator const T&() const & { return value_; }
   };
 
-  static_assert(units::Scalar<my_value<float>>);
-  static_assert(std::convertible_to<my_value<float>, float>);
-  static_assert(std::convertible_to<float, my_value<float>>);
-
 }  // namespace
 
 namespace units {
@@ -92,6 +88,10 @@ namespace std {
 
 namespace {
 
+  static_assert(units::Scalar<my_value<float>>);
+  static_assert(std::convertible_to<my_value<float>, float>);
+  static_assert(std::convertible_to<float, my_value<float>>);
+
   using namespace units;
 
   // class invariants